Integrating photometer

Details Integrating photometer Integrating photometer

1984-02-03

1986-09-30

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D10 47

Patent

active

D02859319

REFERENCES:
patent: D157378 (1950-02-01), Kingsnorth
patent: D213025 (1968-12-01), Sakow
patent: D257851 (1981-01-01), Speck
patent: 3999061 (1976-12-01), McLaughlin
patent: 4013886 (1977-03-01), Schmid
patent: 4212535 (1980-07-01), Sanders
patent: 4544843 (1985-10-01), Kern
patent: 4558953 (1985-12-01), Yamada

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