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Die große Enzyklopädie des mechanischen Rechnens

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Patent:US4884973


Patent:US 4884973
Title:Mathematic teaching aid
Date:05.12.1989
Place:371 Sweetbriar Rd., King of Prussia, PA
Country:USA
Person:Pak, Kyoungsik
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US4884973 (espacenet),  US4884973 (uspto)


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Aus der Patentschrift US4884973