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Patent:US1052437


Patent:US 1052437
Title:Calculating Machine
Date:04.02.1913
Place:
Country:USA
Person:C. L. Nelson
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US1052437 (espacenet),  US1052437 (uspto)


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Aus der Patentschrift US1052437

Improvement of Patent:US897768 and Patent:US933486