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Patent:US1190171


Patent:US 1190171
Title:Combined type-writing and computing machine
Date:04.07.1916
Place:Newark, NJ und New York
Country:USA
Person:Hart, Frederick (P)
Company:Underwood (P) Computing Machine Comp.
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Link to the patent office:
(without guarantee)
 US1190171 (espacenet),  US1190171 (uspto)


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