4. Radiant energy
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Frequency sensitive level detecting apparatus

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Frequency tunable resonant scanner

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Frequency tunable resonant scanner

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Frequency tunable resonant scanner and method of making

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Frequency tunable resonant scanner and method of making

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reissue Patent

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Frequency tunable resonant scanner and method of making

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Fresnel antenna

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Frictionless translational bearing for optical instrument elemen

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Front accessible optical beam switch

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Fuel property detection device

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Function test means of photoelectric type smoke detector

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Fused glass detector

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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