Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-04-14
1984-12-04
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02766205
REFERENCES:
patent: D166933 (1952-06-01), Secofsky
patent: 2483711 (1949-10-01), Roos
patent: 2926591 (1960-03-01), Huffman
patent: 3105430 (1963-10-01), Fernelius
patent: 4437753 (1984-03-01), Dunn
Hama Hamaphot KG Hanke & Thomas
Holtje Nelson C.
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