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Patent:US2831512


Patent:US 2831512
Title:Sawyer’s calculating board
Date:22.04.1958
Place:
Country:USA
Person:Greenemeyer John R
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
 US2831512 (espacenet),  US2831512 (uspto)


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Aus der Patentschrift US2831512