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Patent:US1640703


Patent:US 1640703
Title:Tabular calculator
Date:30.08.1927
Place:
Country:USA
Person:Hoffman Alfred W
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US1640703 (espacenet),  US1640703 (uspto)


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Aus der Patentschrift US1640703