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WO1992008940A1 - Fours pour traiter des lamelles - Google Patents

Fours pour traiter des lamelles Download PDF

Info

Publication number
WO1992008940A1
WO1992008940A1 PCT/GB1991/002013 GB9102013W WO9208940A1 WO 1992008940 A1 WO1992008940 A1 WO 1992008940A1 GB 9102013 W GB9102013 W GB 9102013W WO 9208940 A1 WO9208940 A1 WO 9208940A1
Authority
WO
WIPO (PCT)
Prior art keywords
oven
lamellae
door
tunnel
conveyor
Prior art date
Application number
PCT/GB1991/002013
Other languages
English (en)
Inventor
Alan William Lucas
Original Assignee
Nubal Electronics Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nubal Electronics Ltd filed Critical Nubal Electronics Ltd
Publication of WO1992008940A1 publication Critical patent/WO1992008940A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/007—Partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/029—Multicellular type furnaces constructed with add-on modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path on or in trucks, sleds, or containers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids or removable covers
    • F27D1/1858—Doors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path on or in trucks, sleds, or containers
    • F27B9/262—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path on or in trucks, sleds, or containers on or in trucks
    • F27B2009/264—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path on or in trucks, sleds, or containers on or in trucks the truck carrying a partition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B2009/305—Particular conformation of the furnace
    • F27B2009/3055—Non-uniform section through the length of the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids or removable covers
    • F27D1/1858—Doors
    • F27D2001/1891—Doors for separating two chambers in the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/124—Sleds; Transport supports
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/227—Drying of printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3494—Heating methods for reflowing of solder

Definitions

  • This invention relates to ovens for treating lamellae. While the invention is particularly suitable for use with ovens for handling printed circuit board blanks during the production process and before the application of components thereto, the invention may be applied to ovens for other lamellae in the form of rigid or semi-rigid sheets, plates, cards or the like; the invention is particularly, but not exclusively, concerned with ovens in which the lamellae to be heated are held at only one edge to avoid damage to the broad surfaces of the lamellae or, for example, to fragile or uncured coatings thereon.
  • the lamellae are conveyed through a tunnel oven in spaced array with their planes generally parallel and approximately perpendicular to the direction of travel. While various heating systems may be used, in a particular arrangement hot air is blown across the oven between the printed circuit boards as they pass through the oven the air being admitted at one side and exhausted from the other and this, creates laminar air flow over the boards. It is desirable to maintain as near as possible uniform temperature across the width, length and height of the tunnel.
  • the apertures at the entrance to and exit from the tunnel may be provided with means to reduce the exchange of air between the interior and exterior and examples of such means are air curtains, doors and shutters.
  • the apertures must, for reasons of economy, be sufficiently large to handle the largest format of printed circuit board commonly in use.
  • the largest size in common use today is 650mm by 610mm and it is usual for the apertures at the entrance and exit of the tunnel to be of the order of 760mm by 700mm. There is thus a substantial gap around even the largest printed circuit boards and when the oven is used with smaller printed circuit boards, the gap is very substantial.
  • the present invention provides a means of heating lamellae in a tunnel oven, in a way which minimises energy requirements without the use of air curtains, doors or shutters.
  • the lamellae are conveyed through a tunnel oven in spaced array with their planes generally parallel and approximately perpendicular to the direction of travel, the lamellae being preceded and succeeded by baffle plates which more with the lamellae lie in planes approximately parallel to the lamellae and have dimensions which approximately match the cross sectional dimensions of the tunnel.
  • the invention may be seen to consist in a method of heating lamellae in the manner described.
  • the doors are movable through the oven independently of the lamellae, a leading door being releasably held at the exit end of the oven and a trailing door being releasably held at the entry end of the oven during operation of the oven and except during exit and entry respectively of lamellae.
  • the method uses at least four doors which are independently movable through the oven and the procedure is as follows: 1) position one door at the exit end of the oven and releasably hold it there and a second door at the entry end of the oven and releasably hold it there; 2) introduce a batch of lamellae to the entry end of the oven while moving the second door through the oven to the exit end and releasably hold it there and moving the first door out of the oven; 3) introduce a third door to the entry end of the oven and move the third door through the oven behind the lamellae to the exit end and releasably hold the third door there; and 4) position a fourth door at the entry end of the oven.
  • a tunnel oven has a conveyor with means of supporting lamellae in spaced array with their planes generally parallel and approximately perpendicular to the direction of travel, and baffle plates carried by the conveyor to be located ahead of and behind lamellae supported on the conveyor, the baffle plates having dimensions which approximately match the cross sectional dimensions of the tunnel.
  • a rack for supporting lamellae during their passage through a tunnel oven has a base having a plurality of transversely extending holders for the receipt of the lower edges of lamellae and at or adjacent each end of the base a baffle plate extending upwards from the base.
  • the invention may be applied to an oven having a conveyor which itself is provided with means for supporting the individual lamellae, such as holders or slots, and to an oven of the kind in which a plain conveyor supports separate racks in which the lamellae are supported.
  • the oven is preceded and succeeded by plain insulated tunnel sections which co-operate with the baffles, effectively to seal off the tunnel of the oven itself.
  • Figure 1 is side elevation of the first oven;
  • Figure 2 is an end elevation of the first oven;
  • Figure 3 is a side elevation to larger scale of a rack used in conjunction with the oven shown in Figures l and 2;
  • Figure 4 is an end elevation on a much enlarged scale of a holder forming part of the conveyer of an alternative construction of oven;
  • Figure 5 is a side elevation of another oven;
  • Figure 6 is a side elevation of a single mobile door used with the oven shown in Figure 5;
  • Figure 7 is an end elevation of the door shown in Figure 6;
  • Figure 8 is a diagrammatic longitudinal section to a larger scale of part of the oven shown in Figure 5 illustrating a catch;
  • Figure 9 is a view similar to Figure 5 with two mobile doors in position shortly after commencement of operation of the oven;
  • Figure 10 is a view similar to Figure 9 showing the position at a later stage;
  • Figure 11 is a view similar to Figures 9 and 10 showing the position at a yet later stage.
  • the oven shown in Figures 1 and 2 comprises a base 1 on which there is mounted an oven 10 comprising a first oven section 2 and a second oven section 3 contiguous to the first oven section 2.
  • a conveyer 4 extends through the oven 10 extending beyond the oven to provide a loading section 5 and an unloading section 6.
  • the oven 10 and the conveyor 4 make a tunnel 7 the walls of which are insulated and provided with means, not shown, for passing a flow of hot air from one side 8 to the other side 9 of the tunnel, apertures being provided in these walls to permit flow of the hot air.
  • the walls of the tunnel are substantially smooth and the tunnel is of constant cross section.
  • the walls of the tunnel are heavily insulated.
  • the oven is intended for the drying of coated lamellae 11 which, as shown in figure 3, are conveyed through the tunnel 7 in racks 12, one of which is shown in figure 3.
  • Each rack 12 comprises a base 13 which is shaped to fit onto and be conveyed by the conveyor 4 and has an upper surface provided with slots 14 which are shaped to receive the lower edges of the lamellae 11 so that the lamellae are supported in spaced array with their planes generally parallel and close to vertical.
  • the rack 12 rigidly supports a front end baffle 15 and at the opposite end it rigidly supports a rear end baffle 16.
  • These baffles are vertical and are rectangular in shape having dimensions which are very slightly smaller than the cross sectional dimensions of the tunnel 7.
  • the top edges and possibly the side edges of the baffles 15 and 16 may be provided with narrow flexible sealing strips 17.
  • the first tunnel section 2 Upstream of the first tunnel section 2 there is an inlet tunnel section 21 while at the downstream end of the second oven section 3 there is an outlet tunnel section 22.
  • These tunnel sections have tunnel openings of the same cross section as the oven sections 2,3 but omit the apertures for the cross flow of air.
  • the lengths of the sections 21 and 22 in the direction of travel of the conveyor 4 are substantially equal to, or slightly more than, the distance between the baffle plates 15 and 16 of the rack 12.
  • Lamellae to be heated are placed in a rack 12 in the manner shown in Figure 3, this being done at a location away from the oven.
  • the filled rack is then placed on the loading section 5 of the conveyor 4 and the rack with the lamellae thereon is transported through the oven.
  • the front baffle 15 reaches the inlet section 21 the aperture of the tunnel will be substantially closed at this end thus preventing the transfer of air through this aperture.
  • the rack becomes a miniature oven within the main oven giving good control over air flow and heat distribution. This condition holds good until until the rear baffle 16 reaches the downstream end of the oven section 3.
  • the forward baffle 15 will leave the exit section 22 but the rearward baffle 16 will continue to close off the tunnel from the exterior until the whole rack has left the exit section 22.
  • Racks can follow one another with a relatively small gap between them and if this is done the tunnel through the oven sections 2 and 3 will remain closed at all times. If a small quantity of lamellae is to be treated or an interruption to flow occurs so that the rear baffle of a rack goes beyond the entrance to the oven section 2 without a subsequent rack being in position, thus allowing air to pass through the aperture of the inlet tunnel section 21, a sensor (not shown) is activated to provide an audible or visual warning to the operator who may introduce an empty rack fitted with front and rear baffles 15 and 16 to re-seal the oven. Alternatively the oven could be provided with doors or other conventional sealing means for use in such circumstances.
  • baffles are introduced into a slot ahead of a batch of lamellae and a further baffle is introduced into a slot to the rear of the batch of lamellae so that these baffles, which are of similar dimensions to the baffles 15 and 16 shown in Figure 3, perform the same function as those baffles to seal the tunnel as the lamellae passes' through the tunnel.
  • baffles will be introduced into the conveyor at suitable intervals so that the baffles are spaced apart by distances approximately equal to the lengths of the inlet and outlet sections 21 and 22.
  • the tunnel has cross sectional dimensions of 760mm wide by 700mm high and the clearance between the edges of the baffles 15 and 16 and the top and side walls of the tunnel 7 is of the order of 5mm. Flow through the 5mm gap is minimised by the sealing strips 17.
  • Each of the sections 2 and 3 of the oven are 600mm long while the lengths of the inlet sections 21 and 22 and the distance between the baffles 15 and 16 of the rack 12 are approximately 300mm.
  • the lamellae or boards 11 are loosely held in the slots 14 and accordingly tend to lean over very slightly.
  • the front end baffle and the rear end baffle are interconnected by light bars which run on either side of the boards 11 and are shaped in the manner of combs, the teeth extending horizontally between adjacent boards to hold the boards in a vertical position.
  • a top bar may extend between the baffles 15 and 16 and have depending teeth extending between the boards at their upper edges. These bars not only serve to maintain the boards upright but also add rigidity to the baffles.
  • the oven shown in Figure 5 comprises a base section 41 containing conveyor means for advancing racks carrying boards through an oven 42 in the direction of the arrow 43.
  • the conveyor comprises a stationary ball bearing bed on which the racks travel and a conveyor belt having entraining means to advance the racks and the baffles.
  • the oven 42 has an infeed section 44, an oven area 45 and an outfeed section 46.
  • Each of the single baffles or doors 47 used with the oven shown in Figure 5 comprises a support section 48 of downwardly open channel section and a door section 49 which consists of a rectangular plate which is secured by welding to the channel 48.
  • a striker plate 50 Depending from the web of the support section 48 is a striker plate 50.
  • the conveyor comprises two parallel rails 51 which guide the racks 13 and the doors 47, the rails passing between the ends of the striker plate 50 and the flanges of the support section 48.
  • the oven includes two overridable pressure catches 52,53 the construction of one of which is shown in detail in Figure 8.
  • the catch comprises a rocker 54 located beneath the bed of the conveyor and pivoted at a centre point on a horizontal pin 55.
  • a detent plate 56 Extending upwardly from the downstream end of the rocker '54 is a detent plate 56 which passes through an aperture 57 in the bed of the conveyor into the path of the striker plate 50.
  • a compression spring 58 biases the rocker 54 in a counter-clockwise direction as seen in Figure 8 by an amount which is limited by an adjustable stop 59. If sufficient pressure is applied to the detent plate 56 by the striker plate 50 the rocker 54 is moved clockwise against the bias of the spring 58 to allow the striker plate 50 to pass beyond the detent plate 56.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Tunnel Furnaces (AREA)

Abstract

Procédé pour chauffer des lamelles (11) qui comprend l'acheminement des lamelles dans un four tunnel (42) suivant un réseau espacé dans lequel leurs plans sont globalement parallèles et pratiquement perpendiculaires au sens de passage, les lamelles étant précédées et suivies par des chicanes ou des portes de déviation (47) qui se déplacent avec les lamelles, se trouvant sur un plan pratiquement parallèle aux lamelles et dont les dimensions correspondent approximativement aux dimensions en coupe transversale du tunnel. Les déflecteurs peuvent être fixés sur des grilles (13) transportant les lamelles mais ils doivent pouvoir être mobiles dans le four indépendamment des lamelles. Le procédé préféré est le suivant: on place deux portes A et B, à l'extrémité d'entrée du four, on déplace les portes vers l'avant, la première porte A étant maintenue de manière libérable au niveau de l'extrémité de sortie et la deuxième porte B étant maintenue de manière libérable au niveau de l'extrémité d'entrée du four, puis on introduit une série de lamelles (11) dans l'extrémité d'entrée du four tout en déplaçant la deuxième porte B dans le four jusqu'à l'extrémité de sortie et on déplace la première porte A et on la fait sortir du four; on introduit alors les troisième et quatrième porte C et D jusqu'à l'extrémité d'entrée du four et on déplace la troisième porte C dans le four, derrière les lamelles jusqu'à l'extrémité de sortie et on y maintient de manière libérable la troisième porte; et on maintient la quatrième porte D au niveau de l'extrémité d'entrée.
PCT/GB1991/002013 1990-11-16 1991-11-15 Fours pour traiter des lamelles WO1992008940A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909024931A GB9024931D0 (en) 1990-11-16 1990-11-16 Mobile oven doors
GB9024931.9 1990-11-16

Publications (1)

Publication Number Publication Date
WO1992008940A1 true WO1992008940A1 (fr) 1992-05-29

Family

ID=10685479

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/002013 WO1992008940A1 (fr) 1990-11-16 1991-11-15 Fours pour traiter des lamelles

Country Status (3)

Country Link
EP (1) EP0558537A1 (fr)
GB (1) GB9024931D0 (fr)
WO (1) WO1992008940A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000079197A1 (fr) * 1999-06-17 2000-12-28 Btu International, Inc. Four a poussoir continu dote d'une barriere aux gaz mobile
US6457971B2 (en) 1999-06-17 2002-10-01 Btu International, Inc. Continuous furnace having traveling gas barrier

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR30889E (fr) * 1925-08-17 1926-10-04 Gueron Et Danon Soc Interrupteur
DE1017974B (de) * 1955-10-21 1957-10-17 Gottfried Cremer Dr Einrichtung an Tunneloefen, deren Ofenwagen mit Abdichtungsschiebern versehen sind
EP0316527A2 (fr) * 1987-11-13 1989-05-24 Hans Lingl Anlagenbau und Verfahrenstechnik GmbH & Co. KG Transbordeur du four tunnel
US4979897A (en) * 1988-12-05 1990-12-25 Cryco Twenty-Two, Inc. Atmospheric door closure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR30889E (fr) * 1925-08-17 1926-10-04 Gueron Et Danon Soc Interrupteur
DE1017974B (de) * 1955-10-21 1957-10-17 Gottfried Cremer Dr Einrichtung an Tunneloefen, deren Ofenwagen mit Abdichtungsschiebern versehen sind
EP0316527A2 (fr) * 1987-11-13 1989-05-24 Hans Lingl Anlagenbau und Verfahrenstechnik GmbH & Co. KG Transbordeur du four tunnel
US4979897A (en) * 1988-12-05 1990-12-25 Cryco Twenty-Two, Inc. Atmospheric door closure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000079197A1 (fr) * 1999-06-17 2000-12-28 Btu International, Inc. Four a poussoir continu dote d'une barriere aux gaz mobile
US6283748B1 (en) 1999-06-17 2001-09-04 Btu International, Inc. Continuous pusher furnace having traveling gas barrier
US6457971B2 (en) 1999-06-17 2002-10-01 Btu International, Inc. Continuous furnace having traveling gas barrier
EP1430264A4 (fr) * 2001-08-30 2004-09-08 Btu Int Four continu comportant une barriere contre le gaz en mouvement
CN100357694C (zh) * 2001-08-30 2007-12-26 Btu国际公司 具有移动式隔气板的连续式炉

Also Published As

Publication number Publication date
EP0558537A1 (fr) 1993-09-08
GB9024931D0 (en) 1991-01-02

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