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Patent:US1566979


Patent:US 1566979
Title:Locking device for zero setting mechanism of calculating machines
Date:22.12.1925
Place:Philadelphia
Country:USA
Person:Otto P. Schumann
Company:Rapid Calculator Comp.
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Keywords:
Link to the patent office:
(without guarantee)
 US1566979 (espacenet),  US1566979 (uspto)


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