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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US1528061


Patent:US 1528061
Title:Calculating Game
Date:03.03.1925
Place:
Country:USA
Person:Joyce Agnes, Oscar Mautner, Carl Kraft
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US1528061 (espacenet),  US1528061 (uspto)


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Aus der Patentschrift US1528061