Electric flash unit

Details Electric flash unit Electric flash unit

1981-11-20

1984-03-13

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02730138

REFERENCES:
patent: D233257 (1974-10-01), Holtje
patent: D241273 (1976-08-01), Okuno
patent: D250475 (1978-12-01), Kando
patent: D263720 (1982-04-01), Takematsu
patent: 4078240 (1978-03-01), Kaneko
patent: 4190880 (1980-02-01), Esaki
patent: 4233648 (1980-11-01), Geissler
patent: 4251854 (1981-02-01), Kaneko
patent: 4276579 (1981-06-01), Yako
patent: 4333127 (1982-06-01), Alkema

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