Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1986-02-28
1988-03-01
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D14 11, D16 32, D16 38
Patent
active
D02945037
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Anderson David W.
Holtje Nelson C.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
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