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1801891
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Information
Patent Grant
1801891
References
Source
Patent Number
1,801,891
Date Filed
Not available
Date Issued
Tuesday, April 21, 1931
93 years ago
CPC
A63B71/0672 - using non-electronic means
A63F11/0051 - Indicators of values
A63F2009/0018 - with means for holding a pen or pencil
A63F2011/0067 - Score or tally sheets
A63F2250/482 - with holes or fingers
US Classifications
283 - Printed matter
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