Mathematical teaching block

Details Mathematical teaching block Mathematical teaching block

1990-06-15

1993-08-31

Ansher, Bernard

Games, toys, and sports goods

Toy

Representation or scale model

Patent

active

D03389294

REFERENCES:
patent: D281183 (1985-10-01), Kato
patent: 1216840 (1917-02-01), Ramsey
patent: 2093341 (1937-09-01), Reiche
patent: 3662486 (1972-05-01), Freedman
patent: 4026065 (1977-05-01), Dick
patent: 4606732 (1986-08-01), Lyman
patent: 5000713 (1991-03-01), Cheng

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