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Patent:US1231523


Patent:US 1231523
Title:Combined type writing and computing machine
Date:26.06.1917
Place:Harford, CT 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)
 US1231523 (espacenet),  US1231523 (uspto)


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