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Patent:US2731206


Patent:US 2731206
Title:Calculating machine function control keys interlock
Date:17.01.1956
Place:Chicago
Country:USA
Person:Erhard M. Lippert Ralph L. Schultz Albert V. Neyfeldt
Company:Victor (P) Adding Machine Co.
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Link to the patent office:
(without guarantee)
 US2731206 (espacenet),  US2731206 (uspto)


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