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Die große Enzyklopädie des mechanischen Rechnens

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Patent:CH39458


Patent:CH 39458
Title:Rechenlehrmittel
Date:16.03.1908
Place:Österreich
Country:Switzerland
Person:Schelivsky, Franz (P), Weyrer, Franz (P)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 CH39458


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Aus der Patentschrift CH39458