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Patent:US5039603


Patent:US 5039603
Title:Educational system for teaching counting and equation solving strategies
Date:13.08.1991
Place:(2315 Broad Pke., Cinnaminson, NJ 08077
Country:USA
Person:Pocius, Frank (P)
Company:
Internal Links:Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 US5039603 (espacenet),  US5039603 (uspto)


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Aus der Patentschrift US5039603