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#446916
Patent Information
Calendar Perpetual
Cassius M. Hamilton
February 24, 1891
Patent #446916
Patent Number: | 446916 |
Description: | Calendar Perpetual |
Inventor(s): | Cassius M. Hamilton |
Patent Date: | Feb 24, 1891 |
Registration Type: | Patent |
External Research: | https://www.google.c… |
Patent Document: |