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Photo-detector filter

Optics: measuring and testing – Photometers – Photoelectric
Reexamination Certificate

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Photo-detector filter

Optics: measuring and testing – Photometers – Photoelectric
Reexamination Certificate

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Photo-detector filter

Optics: measuring and testing – Photometers
Reexamination Certificate

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Photoelectric radiometer for photographic apparatus

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photographic method for monitoring visibility through measuremen

Optics: measuring and testing – Photometers – Comparison
Patent

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Photographic spot measuring apparatus

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photomechanical transducer

Optics: measuring and testing – Photometers
Patent

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Photomechanical transducer

Optics: measuring and testing – Photometers – Heat absorbing
Patent

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Photometer

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer

Optics: measuring and testing – Photometers – Photoelectric
Reexamination Certificate

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Photometer

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer device and method

Optics: measuring and testing – Photometers
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Photometer having asymmetrical aperture and with compensation fo

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer mode indicator

Optics: measuring and testing – Photometers – Photoelectric
Patent

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Photometer sphere

Optics: measuring and testing – Photometers – Integrating spheres
Patent

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Photometer with modular light emitter

Optics: measuring and testing – Photometers – Photoelectric
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Photometer-digitizer system

Optics: measuring and testing – Photometers – Integrating
Patent

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Photometering apparatus

Optics: measuring and testing – Photometers
Reexamination Certificate

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