Electronic flash unit

Photography and optical equipment – Projector or viewer – With provision for transparency magazine

Patent

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D1605

Patent

active

D02433273

REFERENCES:
patent: 3794822 (1974-02-01), Bergmans
patent: D210169 (1968-02-01), Monson
patent: D233257 (1974-10-01), Holtje

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