Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1977-04-20
1978-11-07
Burke, Wallace R.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1601
Patent
active
D02501988
REFERENCES:
patent: D238817 (1976-02-01), Emmerling
patent: 3882514 (1975-05-01), Graham
Berkey Photo, Inc.
Burke Wallace R.
Kemper Catherine
Neuman Sidney
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