GB2160055A - Laser imaging system for printing - Google Patents

Laser imaging system for printing Download PDF

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Publication number
GB2160055A
GB2160055A GB08510134A GB8510134A GB2160055A GB 2160055 A GB2160055 A GB 2160055A GB 08510134 A GB08510134 A GB 08510134A GB 8510134 A GB8510134 A GB 8510134A GB 2160055 A GB2160055 A GB 2160055A
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United Kingdom
Prior art keywords
output medium
area
scanning
image
pages
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Granted
Application number
GB08510134A
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GB2160055B (en
GB8510134D0 (en
Inventor
Robert J Prichard
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Gerber Systems Corp
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Gerber Scientific Instrument Co
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Publication date
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Publication of GB8510134D0 publication Critical patent/GB8510134D0/en
Publication of GB2160055A publication Critical patent/GB2160055A/en
Application granted granted Critical
Publication of GB2160055B publication Critical patent/GB2160055B/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/387Composing, repositioning or otherwise geometrically modifying originals
    • H04N1/3872Repositioning or masking

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Record Information Processing For Printing (AREA)
  • Preparing Plates And Mask In Photomechanical Process (AREA)

Abstract

A plurality of printed pages are formed on an output medium 17 in positions and orientations corresponding to an imposition format. Different areas of the medium are scanned to form the images for different pages with the beam traveling and being modulated to provide the proper orientation and position for each page. <IMAGE>

Description

SPECIFICATION Laser imaging system and method for imposing pages for printing This invention pertains generally to laser imaging systems and methods, and more particularly to a system and method for imaging a plurality of pages with the proper orientations and positions for printing in an imposition format.
In the printing of books and other publications, a plurality of pages are printed on a single sheet which is then folded to form a series of imposed pages known as a signature. In order for the pages to appear in the proper sequence and orientation in the signature, they must be positioned and oriented properly on the sheet which is folded.The positioning and orientation of the pages on the sheet is known as the imposition format.
In recent years, electronic page composition systems and laser platemakers have provided greatly enhanced flexibility and speed in page composition and plate making. An example of a laser platemaker is found in U.S. Patent 4,393,411, and an example of a computerized composition and plate making system is found in U.S. Patent 4,240,119. In these systems, the output medium is generally scanned in raster fashion to form an image of the page to be printed.Since the scanning is done in a single, fixed direction, e.g. from top to bottom of the page, these systems have heretofore not been suitable for use in the preparation of impositions where different orientations and positions are required for different pages.
We have identified a requirement to provide a new and improved laser imaging system and method which overcome the foregoing and other limitations and disadvantages of laser imaging systems heretofore provided.
We have also identified a requirement to provide a system and method of the above character which can image a plurality of pages on an output medium with the orientations and positions required for an imposition format.
The embodiment described below provides improvements in these respects by scanning one area of a printing plate or other output medium with a laser beam to form an image of one of the pages to be printed, then scanning a second area of the medium with the beam to form an image of a second page. In each area, the direction of beam travel and the date with which the beam is modulated provide the proper orientation and position of the image for the imposition format. In one disclosed embodiment, the images are formed in head-to-head relationship toward opposite ends of the output medium. The beam is advanced to a central position between the ends of the medium, then turned on and scanned in a first direction to image one of the pages in right reading relationship in raster fashion between the central position and one end of the output medium.Thereafter, the beam is returned to the central position, then turned on and scanned in the opposite direction to image a second page in wrong reading relationship between the central position and the other end of the medium. The output medium can be shifted laterally to image additional pages beside the first two.
Figure 1 is a block diagram of one embodiment of a laser imaging system according to the invention.
Figure 2 is a simplified block diagram of the laser platemaker in the imaging system of Figure 1.
Figure 3 is a plan view of a sheet with an imposition format printed in accordance with the invention.
Figure 4 is a schematic drawing of the sheet of Figure 3 folded to form a signature.
As illustrated in Figure 1, the laser imaging system includes an electronic page composer 11 and a laser platemaker 12.This system can be utilized in the production of plates for different types of printing systems including offset lithography, direct lithography (dilitho) and letter press systems. For offset and dilitho systems, the output medium on which the image is formed is the plate itself, and for letter press systems the output medium is a film negative from which the plate is made.
The page composer includes a computer 13 and an interface 14 which can, for example, be of the type described in detail in U.S. Patent 4,240,119.The computer has a keyboard through which data and commands can be entered into the system, and it delivers data and control signals to the platemaker.
The platemaker can be of the flatbed type described in U.S. Patent 4,240,119 or in U.S. Patent 4,393,411, or it can be of another suitable type such as a drum scanner. In addition to the elements shown in Figure 2, it can include a reading system for scanning data from input copy on a read platen. Data read from the input copy can be transferred to the computer via the interface unit, where it can be stored and combined with data input through the computer for presentation to the platemaker. Plates or negatives can be imaged in three different modes of operation: (1) a local mode in which data read from the read platen is imaged directly on the output medium, (2) a computer mode in which data from the computer is imaged on the output medium, and (3) a merge mode in which data from the computer is combined with data from the read platen and imaged on the output medium.In addition, data stored in the computer memory for individual files or raster images can be combined to produce a complete page or other composite raster image.
As illustrated in Figure 2, the platemaker includes a write platen 16 on which the printing plate or output medium 17 is mounted. A writing beam 18 produced by a laser 19 is modulated by modulator 21 in accordance with the data to be imaged on the output medium.The modulated beam is directed to a scanner 22 which causes the beam to scan laterally across the output medium. The scanner is mounted on a carriage 23 which is driven by a reversible drive motor 24 in a direction generally parallel to the longitudinal axis of the output medium. As the carriage advances, the scanner scans the beam over the output medium in raster fashion.
A position sensor 26 monitors the longitudinal position of the carriage. In one presently preferred embodiment, this sensor includes limit switches which are actuated when the carriage reaches opposite ends of its travel. The sensor also includes an optical encoder which provides a signal corresponding to the position of the carriage between the extremes of its travel. If desired, this signal can also be utilized to indicate the end points of the carriage travel.
Means is also provided for shifting the position of the write platen in the lateral direction to permit images of pages to be formed side by side on the output medium. In the embodiment illustrated, this means includes a lateral positioning motor 27 connected to the write platen, and the platen can also be positioned manually, if desired. Data from the electronic page composer 11 is applied to the modulating input of modulator 21 via a memory 29. Data is read into this memory one line at a time, and it can be read out of the memory either in a forward direction for read-right imaging or in a reverse direction for read-wrong imaging. Data read out of the memory can also be complemented to produce negative images, as in the exposure of negatives for letter press plates.
Operation of the platemaker is controlled by a microprocessor 31 which receives inputs from electronic page composer 11 and carriage position sensor 26. The processor delivers output signals to the page composer and to various elements of the platemaker including modulator 26, memory 29, drive motor 24 and lateral positioning motor 27.
Operation and use of the imaging system, and therein the method of the invention, can be described with reference to the imposition format of Figure 3.This figure illustrates a sheet 36 having an imposition format for the 8-page signature shown in Figure 4. Each side of the sheet is divided into four areas by fold lines 37, 38, and the numbers on the sheet designate the pages to be printed in the different areas. The circled numbers represent pages to be printed on the front side of the sheet, and the uncircled numbers represent pages to be printed on the back side. The numbers are oriented in accordance with the directions in which the respective pages should face when they are printed.
Thus, pages 1 and 8 are printed side by side on the lower half of the front side of the sheet, pages 4 and 5 are printed upside down on the upper half of the front side, pages 2 and 7 are printed right side up on the lower half of the back side, and pages 3 and 6 are printed upside down on the upper half of the back side. After all of the pages have been printed, the top half of the sheet is folded rearwardly and down along line 37, then the sheet is folded along line 38 to form the signature shown in Figure 4.
A printing plate for printing the front side of the imposition format illustrated in Figure 3 in an offset process is produced by mounting the plate in a fixed position on write platen 16. Drive motor 24 is actuated to advance carriage 23 at a relatively high speed from its home position near one end of its travel to a central position in which the beam is located midway between the ends of the output medium. Once the carriage reaches the central position, the drive motor advances the carriage at the normal scanning speed in the forward direction, and the beam is turned on and modulated with data for imaging pages 1 and 8 in a readright fashion on the lower half of the output medium.When these images have been formed, the writing beam is turned off, and the drive motor is reversed to return the carriage to the central position at the relatively high speed.Thereafter, the drive motor advances the carriage back toward the home position at the normal scanning speed, and the writing beam is turned on and modulated with data to image pages 4 and 5 in an inverted position on the top half of the plate.These pages are imaged from top to bottom in a read-wrong fashion as the beam travels from the center of the plate toward the top edge of the plate.A plate for printing the back side of sheet 36 can be prepared in a similar manner.
A plate for dilitho printing is produced in a similar manner, with the images reversed so that the pages on the bottom half of the plate are imaged in a read-wrong fashion and the pages on the top are imaged in a read-right relationship. For a negative, the data with which the beam is modulated is complemented to produce the negative image.
A wide variety of imposition formats can be produced with the invention. Additional pages can be imaged both at the sides and at the ends of the original pages simply by shifting the output medium laterally or longitudinally.
In the embodiment disclosed, proper orientation of the images for different pages is achieved by the direction in which the pages are scanned and the order in which the data for each scan line is read out of memory 29.The orientation and positioning of the images can also be controlled by the computer and the page composer, in which case the images can be oriented in other directions by rotation of the data supplied to the platemaker. In this manner, for example, the output images can be rotated 90t to produce plates for printing tabloid newspaper plates side by side.
While the invention has been described with specific reference to printing plates and negatives for making printing plates, it can also be utilized with other photosensitive materials such as films, papers, and proofing materials.For example, images can be formed directly on DYLUX (DuPont trademark) paper for proofing purposes.
It is apparent from the foregoing that a new and improved laser imaging system and method have been provided. While only certain presently preferred embodiments have been described in detail, as wil be apparent to those familiar with the art, certain changes and modifications can be made without departing from the scope of the invention as defined by the following claims.

Claims (14)

1. A system for imaging a plurality of printed pages on an output medium in positions and orientations corresponding to an imposition format characterized by means (22) for scanning a first area (1) of the output medium (17) with a laser beam (18) to form an image of one the pages in the first area, and means (22) for scanning a second area (4) of the output medium (17) with a laser beam (18) to form an image of a second one of the pages in the second area.
2. The system of Claim 1 further characterized by the output medium (17) being a printing plate.
3. The system of Claim 1 further characterized by the means (22) for scanning the first area (1) includes means (23) for advancing the beam (18) in a first direction relative to the output medium (17) as the beam scans across the first area (1) in a direction generally parallel to the first direction, and the means (22) for scanning the second area (4) includes means (23) for advancing the beam (18) in a second direction relative to the output medium as the beam scans across the second area (2) in a direction generally perpendicular to the second direction.
4. The system of Claim 3 further characterized by means (21) for modulating the beam (18) to form the image in one of the areas in a right reading manner and to form the image in the other area in a wrong reading manner.
5. The system of Claim 1 further characterized by the means for scanning the first (1) and second (4) areas of the output medium including a scanning head (22) for deflecting the beam (18) laterally along a path of predetermined iength across the output medium, and means (23) for advancing the scanning head in a longitudinal direction relative to the output medium whereby the output medium is scanned in raster fashion in the first and second areas.
6. The system of Claim 5 further characterized by means (27) for shifting the output medium laterally relative to the scanning head to form images in additional areas (8,5) beside the images formed in the first (1) and second (4) areas.
7. The system of Claim 1 further characterized by the first and second areas (1,4) being positioned toward opposite ends of the output medium (17), and the means for scanning the areas including means (23) for advancing the beam to a central position between the ends of the output medium, means (22) for scanning the output medium (17) in raster fashion between the central position and one end of the medium to form an image in the first area (1), means (23) for returning the beam (18) to the central position, and means (22) for scanning the output medium (17) in raster fashion between the central position and the opposite end of the medium to form an image in the second area (4).
8. The system of Claim 7 further characterized by the image in the first area (1) is formed from top to bottom in a right reading manner, and the image in the second area is formed from top to bottom in a wrong reading manner.
9. A method of imaging a plurality of pages on an output medium in positions and orientations corresponding to an imposition format, characterized by scanning a first area (1) of the output medium (17) with a laser beam (18) to form an image of one of the pages in the first area (1), and scanning a second area (4) of the output medium with the laser beam (18) to form an image of a second one of the pages in the second area (4).
10. The method of Claim 9 further characterized by advancing the beam in a first direction relative to the output medium as the beam scans across the first area in a direction generally perpendicular to the first direction, and advancing the beam in a second direction relative to the output medium as the beam scans across the second area in a direction generally perpendicular to the second direction.
11. The method of Claim 10 further characterized by the beam being modulated to form the image in one of the areas (1) in a right reading manner and to form the image in the other area (4) in a wrong reading manner.
12. The method of Claim 9 further characterized by the first and second areas each being scanned raster fashion by advancing the beam (18) longitudinally of the output medium (17) and deflecting the beam across the medium as it advances longitudinally.
13. The method of Claim 12 further characterized by the step of shifting the output medium (17) laterally to form images in additional ares (8, 5) beside the images formed in the first and second areas (1, 4).
14. In a method of imaging a plurality of pages on an output medium in positions and orientations corresponding to an imposition format, the steps of: scanning a first area of the output medium with a laser beam to form an image of one of the pages in the first area, and scanning a second area of the output medium with a laser beam to form an image of the second one of the pages in the second area, said steps of scanning first and second areas of said output medium including the step of advancing the beam to a central position between the ends of the output medium, scanning the medium in raster fashion between the central position and one end of the medium to form the image of the first page, returning the beam to the central position, and scanning the output medium in raster fashion between the central position and the other end to form the image of the second page.
14. The method of Claim 9 further characterized by the step of advancing the beam (18) to a central position between the ends of the output medium, scanning the medium (17) in raster fashion between the central position and one end of the medium to form the image in the first area (1), returning the beam to the central position, and scanning the output medium in raster fashion between the central position and the other end to form the image in the second area (4).
15. The method of claim 14 further characterized by the image in the first area (1) being formed from top to bottom in a right reading manner, and the image in the second area (4) being formed from top to bottom in a wrong reading manner.
16. A system for imaging a plurality of printed pages on a output medium in positions and orientations corresponding to an imposition format, characterized by a carriage (23) movable in a longitudinal direction relative to the output medium (17) between a home position and a remote position, drive means (24) for advancing the carriage between the home and remote positions, means (22) mounted on the carriage for deflecting a laser beam (18) in a direction generally perpendicular to the direction of carriage movement to scan the output medium in raster fashion along successive scan lines, means (21) for modulating the laser beam in accordance with the images to be formed, means (31) for actuating the drive means at a relatively high speed in a forward direction to advance the carriage to a central position between the home position and the remote position with the beam turned off, means (31) for actuating the drive means at a normal scanning speed in the forward direction to drive the carriage from the central position to the remote position with the beam turned on and modulated in accordance with data for a first page, means (31) for actuating the drive means at a relatively high speed in a reverse direction to return the carriage to the central position with the beam turned off, and means (31) for actuating the drive means at the normal scanning speed in the reverse direction with the beam turned on and modulated in accordance with data for another page.
17. The system of Claim 16 further characterized by the output medium (17) being a printing plate.
18. The system of Claim 16 further characterized by the beam (18) being modulated to image the first page from top to bottom in right reading fashion and to image the other page from top to bottom in wrong reading fashion.
19. The system of Claim 16 further characterized by means (27) for shifting the output medium (17) laterally to position the beam (18) in different areas displaced laterally of each other on the output medium.
20. A system for imaging a plurality of printed pages on an output medium substantially as described herein with reference to the accompanying drawings.
21. A method of imaging a plurality of pages on an output medium substantially as described herein with reference to the accompanying drawings.
Amendments to the claims have been filed, and have the following effect: Claims 1,3-5,7,9-12,14 above have been deleted or textually amended.
New or textually amended claims have been filed as follows:
1. In a system for imaging a plurality of separate printed pages on a single area of an output medium in positions and orientations corresponding to an imposition format:means for holding said output medium, means for first scanning a first portion of said single area of said output medium while said output medium is held by said holding means with a laser beam to form an image of one of said pages in said first portion of said single area of said output medium, and means for thereafter scanning a second portion of said single area of said output medium while said output medium is held by said holding means with a laser beam to form an image of a second one of said pages in said second portion of said single area of said output medium.
3. The system of claim 1 wherein said means for scanning said first portion of said single area of said output medium includes means for advancing the beam in a first direction relative to said output medium as the beam scans across said first portion in a direction generally parallel to the first direction , and said means for scanning said second portion of said single area of said output medium includes means for advancing the beam in a second direction relative to the output medium as the beam scans across the second portion of said single area of said output medium in a direction generally perpendicular to the second direction.
4. The system of claim 3 including means for modulating the beam to form the image in one of said portions of said single area of said output medium in a right reading manner and to form the image in the other portion in a wrong reading manner.
5. The system of claim 1 wherein the means for scanning said first and second portions of said single area of said output medium includes a scanning head for deflecting the beam laterally along a path of predetermined length transversely of said single area of said output medium , and means for advancing said scanning head in a longitudinal direction relative to said single area of said output medium while said beam is deflected repeatedly across said first portion of said single area and then for advancing said scanning head in a longitudinal direction while said beam is deflected repeatedly across said second portion of said single area whereby said single area of said output medium is scanned in raster fashion successively in said first and second portions of said single area.
7. In a system for imaging a plurality of printed pages on an output medium in positions and orientations corresponding to an imposition format: means for scanning a first area of the output medium with a laser beam to form an image of one of the pages in the first area, and means for scanning a second area of the output medium with a laser beam to form an image of a second one of the pages in the second area, said first and second areas being positioned toward opposite ends of the output medium, and said means for scanning the areas including means for advancing the beam to a central position between the ends of the output medium, means for scanning the output medium in raster fashion between the central position and one end of the medium to form the image of the first page, means for returning the beam to the central position, and means for scanning the output medium in raster fashion between the central position and the opposite end of the medium to form the image of the second page.
9. In a method of imaging a plurality of separate pages on a single area of an output medium in positions and orientations corresponding to an imposition format, the steps of: first scanning a first portion of said single area of said output medium with a laser beam to form an image of one of the pages in said first portion, and then scanning a second portion of said single area of said output medium with the laser beam to form an image of a second one of the pages in said second portion.
10. The method of claim 9 wherein said beam is advanced in a first direction relative to said single area of said output medium as it is scanned across said first portion of said single area in a direction generally perpendicular to said first direc tion, and said beam is advanced in a second direction relative to said single area of said output medium as it is scanned across said second portion of said single area in a direction generally perpendicular to the second direction.
11. The method of claim 10 wherein said beam is modulated to form the image in one of said portions of said single area in a right reading manner and to form the image in the other portion of said single area in a wrong reading manner.
12. The method of claim 9 wherein said first and second portions are each scanned in raster fashion by advancing said beam longitudinally of said single area of said output medium and deflecting said beam repeatedly transversely of said single area as it advances longitudinally.
GB08510134A 1984-06-08 1985-04-18 Laser imaging system for printing Expired GB2160055B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61858984A 1984-06-08 1984-06-08

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GB8510134D0 GB8510134D0 (en) 1985-05-30
GB2160055A true GB2160055A (en) 1985-12-11
GB2160055B GB2160055B (en) 1987-11-04

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GB08510134A Expired GB2160055B (en) 1984-06-08 1985-04-18 Laser imaging system for printing

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JP (1) JPS60264251A (en)
CA (1) CA1236172A (en)
DE (1) DE3520077A1 (en)
FR (1) FR2565705B1 (en)
GB (1) GB2160055B (en)

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EP0330343A2 (en) * 1988-02-24 1989-08-30 Digital Equipment Corporation Printing apparatus and method
GB2249993A (en) * 1990-09-17 1992-05-27 Toppan Printing Co Ltd Determining print / non-print area ratios from bitmapped printing plate data.
EP0495563A2 (en) * 1991-01-15 1992-07-22 Scitex Corporation Ltd. Apparatus and techniques for computerized printing
GB2298986A (en) * 1995-03-13 1996-09-18 Gerber Systems Corp Method of making printing plates
US5875288A (en) * 1990-02-05 1999-02-23 Scitex Corporation Ltd. Apparatus and techniques for computerized printing
US6441914B1 (en) 1999-10-08 2002-08-27 Creoscitex Corporation Ltd. Prediction and prevention of offset printing press problems

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DE4031418A1 (en) * 1989-10-04 1991-04-18 Mitsubishi Paper Mills Ltd X- and Y- axis scanner for type setting equipment - uses laser scanner movable in Y direction in low junction with plate movable in X direction

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GB1356499A (en) * 1971-05-20 1974-06-12 Perkin Elmer Corp Printing plate blank and processing method
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EP0330343A3 (en) * 1988-02-24 1991-02-27 Digital Equipment Corporation Printing apparatus and method
EP0330343A2 (en) * 1988-02-24 1989-08-30 Digital Equipment Corporation Printing apparatus and method
US5875288A (en) * 1990-02-05 1999-02-23 Scitex Corporation Ltd. Apparatus and techniques for computerized printing
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US6856424B2 (en) 1990-02-05 2005-02-15 Creo Il. Ltd. Closed loop ceps-press control systems
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GB2249993A (en) * 1990-09-17 1992-05-27 Toppan Printing Co Ltd Determining print / non-print area ratios from bitmapped printing plate data.
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EP0495563A2 (en) * 1991-01-15 1992-07-22 Scitex Corporation Ltd. Apparatus and techniques for computerized printing
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GB2298986B (en) * 1995-03-13 1997-03-12 Gerber Systems Corp Method for making a plurality of printing plates
FR2731650A1 (en) * 1995-03-13 1996-09-20 Gerber Systems Corp METHOD FOR MANUFACTURING A PLURALITY OF INPRESSION PLATES
GB2298986A (en) * 1995-03-13 1996-09-18 Gerber Systems Corp Method of making printing plates
US6441914B1 (en) 1999-10-08 2002-08-27 Creoscitex Corporation Ltd. Prediction and prevention of offset printing press problems

Also Published As

Publication number Publication date
FR2565705A1 (en) 1985-12-13
GB2160055B (en) 1987-11-04
CA1236172A (en) 1988-05-03
GB8510134D0 (en) 1985-05-30
FR2565705B1 (en) 1994-03-25
DE3520077A1 (en) 1985-12-12
JPS60264251A (en) 1985-12-27

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