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  2. Marine electronics - Wikipedia

    en.wikipedia.org/wiki/Marine_electronics

    The top manufacturer is Garmin's Marine division with a turnover of US$917 Million in 2023 [8] followed by Brunswick-owned Navico Group (Simrad, Lowrance, B&G and several other brands), with a turnover of US$915 Million (although this includes sales of equipment which is not marine electronics, such as batteries, cables and pumps).

  3. Foghorn - Wikipedia

    en.wikipedia.org/wiki/Foghorn

    Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.

  4. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    An electric buzzer uses a similar mechanism to an interrupter bell, but without the resonant bell. They are quieter than bells, but adequate for a warning tone over a small distance, such as across a desktop. A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric.

  5. Fog bell - Wikipedia

    en.wikipedia.org/wiki/Fog_bell

    Initially, small boats were fitted with bells and anchored. The first true bell buoy was developed in 1852 by Lieutenant Brown, who worked at the Lighthouse Establishment . He took a buoy and constructed a mount for the bell, under which he placed a plate with radial grooves on which a cannonball rolled and, moved by the swell, struck the bell ...

  6. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    European Siren for fire detection system. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.

  7. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    Primary power supply: Commonly, a commercial power utility supplies a non-switched 120 or 240-volt alternating current source. A dedicated branch circuit is connected to the fire alarm system and its constituents in non-residential applications. "Dedicated branch circuits" should not be confused with "Individual branch circuits" which supply ...