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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US6065970


Patent:US 6065970
Title:Method of playing an educational mathematical game
Date:23.05.2000
Place:426 Greenacres Dr.,
Country:USA
Person:Elliott, Karen Crawford
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US6065970 (espacenet),  US6065970 (uspto)


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