Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1976-12-13
1978-06-27
Ansher, Bernard
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1606
Patent
active
D02483084
REFERENCES:
patent: 214501 (1879-04-01), Fritsch
patent: 1578899 (1926-03-01), Lohmann
patent: 2970220 (1961-01-01), Bouwers
patent: 3541323 (1970-11-01), Stewart et al.
patent: 3598468 (1971-08-01), Perry
Sky and Telescope, Aug. 1958, pp. 529, 530, 533 and 534.
Ansher Bernard
Richards Theodore W.
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