4. Measuring, testing, or signalling instruments
  5. Security or signal instrument or casing
  6. Element or attachment

Richard E. Hiltenbrand

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Smoke detector with test apparatus

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

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Unipolar chamber for an ionization smoke detector

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Element or attachment
Patent

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Unipolar chamber for ionization smoke detector

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Element or attachment
Patent

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Profile ID: LFUS-PAI-P-810992

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