Tripod

Details Tripod Tripod

1985-04-05

1987-07-21

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02909634

REFERENCES:
patent: D221693 (1971-08-01), Bradspies
patent: D276622 (1984-12-01), Mooney
patent: 663535 (1900-12-01), Essner
patent: 2463655 (1949-03-01), Temple
patent: 3963207 (1976-06-01), Guasti
patent: 4208946 (1980-06-01), Van Sickle
patent: 4579436 (1986-04-01), Jaumann

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