4. Communications: electrical
  5. Systems
  6. Call station

John Dobrzanski

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Ionization smoke detector and alarm system

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent

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Ionization smoke detector and alarm system

Communications: electrical – Systems – Call station
Patent

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Ionization smoke detector with controlled sensitivity

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent

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Smoke detection alarm device

Communications: electrical – Systems – Call station
Patent

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Profile ID: LFUS-PAI-P-945465

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