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Die große Enzyklopädie des mechanischen Rechnens

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Patent:GB587220


Patent:GB 587220
Title:Apparatus for the use in the teaching of arithmetic operations
Date:17.04.1947
Place:
Country:Great Britain
Person:Lancelot Hogben
Company:
Internal Links:
Keywords:Abakus
Link to the patent office:
(without guarantee)
 GB587220


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Aus der Patentschrift GB587220