4. Measuring, testing, or signalling instruments
  5. Security or signal instrument or casing
  6. Alarm or control thereof

William G. Kahl, Jr.

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Adjustable mirror mount for photoelectric intrusion detector

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

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Infrared intrusion detector with beam indicators

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent

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Infrared intrusion detector with optical pattern locators

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent

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Intrusion detection system

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Intrusion detector

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Patent

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Profile ID: LFUS-PAI-P-832428

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