Mathematical aid

Details Mathematical aid Mathematical aid

1979-07-02

1982-02-02

Lee, Lester L.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 62, D1907

Patent

active

D02628929

REFERENCES:
patent: D150506 (1948-08-01), Blanc
patent: 667397 (1901-02-01), Jones
patent: 2471271 (1949-05-01), Green

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