Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-04-15
1982-09-07
Spangler, Robert C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D 9372, D 9375, D0903
Patent
active
D02660954
REFERENCES:
patent: D194559 (1963-02-01), Rolley et al.
patent: D196076 (1963-08-01), Schnur
patent: D237256 (1975-10-01), Weckman
patent: D248277 (1978-06-01), Hartman et al.
patent: D249229 (1978-09-01), Schacher et al.
Spangler Robert C.
Tokyo Shibaura Denki Kabushiki Kaisha
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