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Die große Enzyklopädie des mechanischen Rechnens
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USA
Patent:US1503299
Patent:
US 1503299
Title:
Calculator
Date:
29.07.1924
Place:
Carson, Iowa
Country:
USA
Person:
Glen L. Canon
Company:
Internal Links:
Keywords:
Link to the patent office:
(without guarantee)
US1503299
(espacenet),
US1503299
(uspto)
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