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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB407274


Patent:GB 407274
Title:Improved device for demonstrating the fundamental arithmetical operations
Date:15.03.1934
Place:
Country:Great Britain
Person:Giulio Sbocchelli
Company:
Internal Links:
Keywords:Abakus
Link to the patent office:
(without guarantee)
 GB407274


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Aus der Patentschrift GB407274