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Patent:US106881


Patent:US 106881
Title:Improvement in adding-machine
Date:30.08.1870
Place:Gardiner, Maine, USA
Country:USA
Person:Spear, Charles E. (P)
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US106881 (espacenet),  US106881 (uspto)


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