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3807868
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Information
Patent Grant
3807868
References
Source
Patent Number
3,807,868
Date Filed
Not available
Date Issued
Tuesday, April 30, 1974
50 years ago
CPC
G01N21/474 - Details of optical heads therefor
G01N21/21 - Polarisation-affecting properties
G01N33/346 - paper sheets
G01N2021/8681 - Paper fibre orientation
US Classifications
356 - Optics: measuring and testing
073 - Measuring and testing
250 - Radiant energy
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