Vignetting device

Details Vignetting device Vignetting device

1976-02-23

1977-11-29

Burke, Wallace R.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1605

Patent

active

D02465272

REFERENCES:
patent: D183462 (1958-09-01), Maiershofer et al.
patent: 369453 (1887-09-01), Kuhn
patent: 1743841 (1930-01-01), Zurovsky
patent: 2664781 (1954-01-01), Waller
patent: 2972931 (1961-02-01), Roob

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