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Patent:US1388257


Patent:US 1388257
Title:Combined typewriting and computing machine
Date:23.08.1921
Place:Jersey City, NJ und New York
Country:USA
Person:Hart, Frederick (P)
Company:Underwood (P) Computing Machine Comp.
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Keywords:
Link to the patent office:
(without guarantee)
 US1388257 (espacenet),  US1388257 (uspto)


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