Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1984-03-01
1986-07-15
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Detailed holder for original
248463, 355122, G03B 2762
Patent
active
046002987
ABSTRACT:
A photomask assembly and method of use are disclosed wherein a hinged pair of plates may be held in an open position by means of a movable arm mounted on one of the plates.
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PPG Industries Inc.
Seidel Donna L.
Wintercorn Richard A.
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