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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB359210


Patent:GB 359210
Title:Improved apparatus for teaching calculations to children and for like
Date:22.10.1931
Place:
Country:Great Britain
Person:Sarah Weaver Stephens
Company:
Internal Links:Lehrmittel, Kugelrechner
Keywords:
Link to the patent office:
(without guarantee)
 GB359210


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Aus der Patentschrift GB359210