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Patent:US2710139


Patent:US 2710139
Title:Correction key mechanism for adding machine
Date:07.06.1955
Place:Bridgeport, CT und New York
Country:USA
Person:Swanson, Oscar (P)
Company:Underwood (P) Corp.
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Keywords:
Link to the patent office:
(without guarantee)
 US2710139 (espacenet),  US2710139 (uspto)


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