Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1978-04-07
1981-01-27
Kemper, Catherine E.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D19 92, D1603, D1999
Patent
active
D02580667
REFERENCES:
patent: D192278 (1962-02-01), Meyer
patent: 1695432 (1928-12-01), Lovejoy
Xerox Disclosure Journal-Jul./Aug. 1977, vol. 2, No. 4, p. 53, Paper Cassette.
Kemper Catherine E.
Stover, Jr. Thomas C.
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