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Patent:US940708


Patent:US 940708
Title:Keyboard locking mechanism for adding machines
Date:23.11.1909
Place:Kingston, PA
Country:USA
Person:McFarland, Charles Numan (P)
Company:Adder Machine Comp.
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Link to the patent office:
(without guarantee)
 US940708 (espacenet),  US940708 (uspto)


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