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US3727527A
(en)
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Photographic apparatus with liquid crystal voltage indicator
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US1990361A
(en)
|
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Exposure meter
|
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FR2473717A1
(fr)
|
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Retroreflectometre perfectionne a lecture directe
|
|
US3486821A
(en)
|
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System for integrating light energy
|
|
US2214283A
(en)
|
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Exposure meter
|
|
US3390576A
(en)
|
|
Solar radiation measuring device
|
|
BE462007A
(enrdf_load_stackoverflow)
|
|
|
|
US4097152A
(en)
|
|
Spectrophotometer with visual spectrum display
|
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US2503768A
(en)
|
|
Photoelectric exposure meter having a reflector facing the photocell
|
|
US3087379A
(en)
|
|
Combined light meter and sighting device
|
|
US2091762A
(en)
|
|
Exposure meter
|
|
US4484819A
(en)
|
|
Reflectometer
|
|
US3575095A
(en)
|
|
Optical apparatus
|
|
US3532035A
(en)
|
|
Photoelectric photometer
|
|
US3780631A
(en)
|
|
Monochromatic photographic exposure process and apparatus
|
|
US3218917A
(en)
|
|
Highly sensitive exposure meter
|
|
US2467304A
(en)
|
|
Dual-purpose light meter having swinging reflector
|
|
US2522987A
(en)
|
|
Photoelectric cell structure incorporating a lens
|
|
FR2528580A1
(fr)
|
|
Appareil mesurant la transparence aux ultraviolets courts pour tester des pierres
|
|
US3685912A
(en)
|
|
Large area retro-transmitting light meter
|
|
BE430361A
(enrdf_load_stackoverflow)
|
|
|
|
US3238454A
(en)
|
|
Overload protection circuit for mirror galvanometer using photoconductive cells to shunt overload current
|
|
US2045797A
(en)
|
|
Illumination meter
|
|
US6144036A
(en)
|
|
Ultraviolet radiation dosimeter
|
|
Capstaff et al.
|
|
A compact motion picture densitometer |