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Die große Enzyklopädie des mechanischen Rechnens

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Patent:CH193121


Patent:CH 193121
Title:Rechenmaschine.
Date:30.09.1937
Place:USA
Country:Switzerland
Person:
Company:Marchant (P)
Internal Links:
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Link to the patent office:
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 CH193121


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Aus der Patentschrift CH193121