Powder cartridge

Details Powder cartridge Powder cartridge

1982-06-01

1985-01-22

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02772892

REFERENCES:
patent: D238658 (1976-02-01), Stone
patent: D253810 (1980-01-01), Stone
patent: D272251 (1984-01-01), Yoshihama

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