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Patent:US2229889


Patent:US 2229889
Title:Calculating Machine
Date:28.01.1941
Place:
Country:USA
Person:Friden, Carl Mauritz Fredrick (P)
Company:Friden (P)
Internal Links:Staffelwalze, geteilt
Keywords:
Link to the patent office:
(without guarantee)
 US2229889 (espacenet),  US2229889 (uspto)


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Aus US2229889

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US2229889A Fig. 12-22