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Patent:US3147919


Patent:US 3147919
Title:Ten-Key Keyboard for Calculating and Bookkeeping Machines
Date:08.09.1964
Place:
Country:USA
Person:Gelling, Helmut (P)
Company:Precisa (P)
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US3147919 (espacenet),  US3147919 (uspto)