Electronic flash unit

Details Electronic flash unit Electronic flash unit

1985-03-05

1987-11-17

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02928051

REFERENCES:
patent: D165784 (1952-01-01), Pennock
patent: D168303 (1952-12-01), Kinney
patent: D174025 (1955-02-01), Dine
patent: D187438 (1960-03-01), Matsui
patent: D190691 (1961-06-01), Ackermann
patent: D192360 (1962-03-01), Kleeberg
patent: D226331 (1973-02-01), Hogue
patent: D237650 (1975-11-01), Ullmann
patent: 4291967 (1981-09-01), Jackson

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