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Patent:US2442402


Patent:US 2442402
Title:Forward and reverse tabulating mechanism for accounting machines
Date:01.06.1948
Place:Dayton
Country:USA
Person:John T. Davidson Paul H. Williams Laurence N. Lehman Jesse R. Ganger James H. Crawford Herman F. Sad
Company:NCR (P)
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Link to the patent office:
(without guarantee)
 US2442402 (espacenet),  US2442402 (uspto)


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