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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB334319


Patent:GB 334319
Title:Device for teaching young children elementary multiplication
Date:04.09.1930
Place:
Country:Great Britain
Person:Montessori, Maria (P)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 GB334319


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Aus der Patentschrift GB334319