Mathematical learning game

Details Mathematical learning game Mathematical learning game

1999-07-14

2000-07-04

Holtje, Martie K.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 59, 1907

Patent

active

D0427637&

REFERENCES:
patent: 0463230 (1891-11-01), Hooly
patent: 0613432 (1898-11-01), Szenhak
patent: 0731175 (1903-01-01), Goodman
patent: 1391986 (1921-09-01), Smith
patent: 3548524 (1970-12-01), Rohnow
patent: 3883968 (1975-05-01), Suzuki
patent: 3927613 (1975-12-01), Nantz
patent: 4651992 (1987-03-01), Danino et al.
patent: 4865324 (1989-09-01), Nesis
patent: 4902230 (1990-02-01), Jones
patent: 5007840 (1991-04-01), Gaskell
patent: 5674076 (1997-10-01), Billings et al.

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