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Patent:US2569508


Patent:US 2569508
Title:Key-Operated Calculator
Date:02.10.1951
Place:
Country:USA
Person:Webb, Christopher Frederick (P)
Company:Plus adder, Bell Punch (P) Company, UK
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Keywords:
Link to the patent office:
(without guarantee)
 US2569508 (espacenet),  US2569508 (uspto)


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Aus der Patentschrift US2569508