Circular slide chart

Details Circular slide chart Circular slide chart

1980-12-01

1983-10-04

Zarfas, Louis S.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D18 10, D1907

Patent

active

D02708442

REFERENCES:
patent: 1662503 (1928-03-01), Krieger
patent: 3280788 (1966-10-01), Robinson, Jr.
patent: 3835299 (1974-09-01), Turney
patent: 4251721 (1981-02-01), Rathbun

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