Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1978-01-16
1979-11-20
Ansher, Bernard
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1606
Patent
active
D02534762
REFERENCES:
patent: D191377 (1961-09-01), Kraus
patent: D199371 (1964-10-01), Kraus
patent: D247854 (1978-05-01), Simmons et al.
patent: 2948189 (1960-08-01), Fischer
patent: 3023503 (1962-03-01), Baker
patent: 3885858 (1975-05-01), Hildemann
patent: 3942865 (1976-03-01), Rand
Sky and Telescope, Mar., 1970, p. 200, Telescope, bottom of page.
Richardson Robert R.
Schneck John J.
Ansher Bernard
Trachtman Jacob
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