Mathematics teaching aid

Details Mathematics teaching aid Mathematics teaching aid

1985-08-08

1988-08-30

Zarfas, Louis S.

Office supplies; artists and teachers materials

Teaching material

D19 60

Patent

active

D02974371

REFERENCES:
patent: D158481 (1950-05-01), Lugar
patent: 1471437 (1923-10-01), Wood
patent: 3908287 (1975-09-01), Darnell

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