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Patent:US2668660


Patent:US 2668660
Title:Plural totalizer adding machine
Date:09.02.1954
Place:San Leandro
Country:USA
Person:Ellerbeck, Grant Clawson (P)
Company:Friden (P) Calculating Machine Co.
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Link to the patent office:
(without guarantee)
 US2668660 (espacenet),  US2668660 (uspto)


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