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3688666
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Information
Patent Grant
3688666
References
Source
Patent Number
3,688,666
Date Filed
Not available
Date Issued
Tuesday, September 5, 1972
52 years ago
CPC
G03B17/08 - Waterproof bodies or housings
G03B27/00 - Photographic printing apparatus
G03B41/026 - combined with slit
US Classifications
396 - Photography
356 - Optics: measuring and testing
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