Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1979-06-13
1981-05-19
Ansher, Bernard
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1601
Patent
active
D02592630
REFERENCES:
patent: D138690 (1944-09-01), Downing
patent: D183305 (1958-08-01), Fisher
patent: D188735 (1960-08-01), Buttles et al.
patent: D236543 (1975-08-01), Berger et al.
patent: D245954 (1977-10-01), Tosaw
patent: 3019689 (1962-02-01), Paulsrud
patent: 3601601 (1971-08-01), Eilenberger
patent: 3753090 (1973-08-01), Tomek
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