Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1981-07-09
1983-10-25
Spangler, Robert C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D 9376, D 9381, D1603
Patent
active
D02711133
REFERENCES:
patent: D155044 (1949-08-01), Smith
patent: D181947 (1958-01-01), Scanland
patent: D195280 (1963-05-01), Bodenheimer
patent: D207128 (1967-03-01), Kelly
patent: D220831 (1971-06-01), Zimmerman
patent: D256665 (1980-09-01), Smythe
patent: D258866 (1981-04-01), Houseman et al.
Birkeland Stephen P.
Sawamura Noboru
Alexander Cruzan
Barnes John C.
Minnesota & Mining Manufacturing Company
Sell Donald M.
Spangler Robert C.
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