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3813160
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Information
Patent Grant
3813160
References
Source
Patent Number
3,813,160
Date Filed
Not available
Date Issued
Tuesday, May 28, 1974
50 years ago
CPC
G03B27/73 - Controlling exposure by variation of spectral composition
G03B27/56 - Mounting enlarger head on column Mounting reproduction camera on column
G03B27/72 - Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
US Classifications
355 - Photocopying
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