Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1984-06-26
1987-06-23
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02904640
REFERENCES:
patent: D221025 (1971-06-01), Fukuda
patent: D223409 (1972-04-01), Fukuda
patent: D229977 (1974-01-01), Nakanishi
patent: D247852 (1978-05-01), Fukuda
patent: D263056 (1982-02-01), Haitori
patent: D271881 (1983-12-01), Kato
patent: D284579 (1986-07-01), Io
patent: D285449 (1986-09-01), Soda
patent: D285450 (1986-09-01), Soda
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