Portable instructional flight aid device

Details Portable instructional flight aid device Portable instructional flight aid device

1977-01-10

1978-08-22

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 67, D1907

Patent

active

D02490463

REFERENCES:
patent: D231934 (1974-06-01), Sidoti
patent: 1882087 (1932-10-01), Ocker
patent: 2331605 (1943-10-01), Gold
patent: 2398724 (1946-04-01), Schulz

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