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3720810
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Patent Grant
3720810
References
Source
Patent Number
3,720,810
Date Filed
Not available
Date Issued
Tuesday, March 13, 1973
51 years ago
CPC
G06K21/06 - Apparatus or tools adapted for slotting or otherwise marking information-retrieval cards
G06K5/00 - Methods or arrangements for verifying the correctness of markings on a record carrier Column detection devices
US Classifications
235 - Registers
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