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Die große Enzyklopädie des mechanischen Rechnens

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Patent:CH163051


Patent:CH 163051
Title: Appareil servant à faciliter le calcul des additions.
Date:04.05.1933
Place:Genf
Country:Switzerland
Person:Pattey, John (P)
Company:
Internal Links:Schaltklinke
Keywords:
Link to the patent office:
(without guarantee)
 CH163051


.