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Patent:US1757669


Patent:US 1757669
Title:Flexible handle connection for calculating machines
Date:06.05.1930
Place:Lake Bluff, IL
Country:USA
Person:Johantgen, Oliver David (P)
Company:Victor (P) Adding Machine Co.
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Link to the patent office:
(without guarantee)
 US1757669 (espacenet),  US1757669 (uspto)


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