D. R. Arndt

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Apparatus for measuring illuminance

Optics: measuring and testing – Photometers – Light absorbing
Patent

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Automatic rangefinding device for use in a camera

Patent

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Fluorescent solar energy concentrator

Batteries: thermoelectric and photoelectric – Thermoelectric – Radiation pyrometer
Patent

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Method and apparatus for reducing the incidence of eye closures

Patent

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Movable infrared filter for an auto ranging camera

Patent

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Profile ID: LFUS-PAI-P-303146

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