Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1979-11-29
1985-01-01
Caun, Peter M.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02770105
REFERENCES:
patent: D254975 (1980-05-01), Gambrell et al.
patent: 4134581 (1979-01-01), Johnson et al.
Datapro Research Corporation Jan. 1978 3M Secretary III Model.
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