Educational aide for measuring mass

Details Educational aide for measuring mass Educational aide for measuring mass

1975-01-28

1976-12-21

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02427877

REFERENCES:
patent: 3485493 (1969-12-01), Pitkanen
patent: D210947 (1968-05-01), Sherburne

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