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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB370060


Patent:GB 370060
Title:Apparatus for teaching arithmetic
Date:07.04.1932
Place:
Country:Great Britain
Person:John James
Company:
Internal Links:
Keywords:Lehrmittel
Link to the patent office:
(without guarantee)
 GB370060


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Aus der Patentschrift GB370060