4. Measuring and testing
  5. Gas analysis
  6. Detector detail

Andreas Hensel

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Alarm detector

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

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Danger detecting system

Communications: electrical – Condition responsive indicating system – With particular coupling link
Reexamination Certificate

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Device for and method of testing a fire alarm

Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer
Reexamination Certificate

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Device for deflecting optical beams

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate

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Fire alarm box with direct and scattered light detection and...

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

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Profile ID: LFUS-PAI-P-2055560

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