Adjustable composition mask

Details Adjustable composition mask Adjustable composition mask

1990-05-25

1993-01-12

Holtje, Nelson C.

Photography and optical equipment

Photographic accessory

Film processing equipment

D 6300

Patent

active

D03324613

REFERENCES:
patent: D121394 (1940-07-01), Lormor
patent: D231403 (1974-04-01), Klayman
patent: D263481 (1982-03-01), Vest
patent: 1277318 (1918-08-01), Johnson
patent: 2246920 (1941-06-01), Kromholz
patent: 2702944 (1955-03-01), Lane et al.
patent: 2791051 (1957-05-01), Scheyer
patent: 3470644 (1969-10-01), Craig
patent: 3709591 (1973-01-01), Alzmann
patent: 4584779 (1986-04-01), Wakamatsu

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