Smoke detection alarm device

Smoke detection alarm system

Smoke detector

Smoke detector

Smoke detector

Smoke detector and alarm

Smoke, fire and gas alarm with remote sensing, back-up emergency

Solid state image pickup apparatus

Solid state temperature responsive switch

Solid state thermistor switch

Sonic monitoring method and apparatus

Sound activated alarm system

Spring-actuated security alarm for a door

Static charge detector having fail-safe voltage surge protection

Static magnetic field metal detector

Strain detection apparatus and method for radiological equipment

Sump water detector with isolated probe having AC applied to its

Supervision of transducers

Swimming pool alarm

Swimming pool alarm system and method with adjustable sensitivit