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Extension telephone bell used by taxi service in Rovigo. Extension bell located on the exterior of a lighthouse in Sprogø. An extension bell or extension ringer [1] is a device that generates a sound to indicate an incoming telephone call, but is not included in a telephone set itself. Extension bells may be louder than ordinary telephone ringers.
For this reason, in the photos below the instrument on the left is, strictly speaking, a 314 and the one on the right a 312, despite the fact that their full potential is not being utilised. The Tele. 332L shown on the left is a bedside extension from an Extension Plan 1A. BELL ON – BELL OFF push buttons were added, forward of the switchook ...
Hand telephone sets consist of three principal parts: the handset, a handset mounting, and an apparatus box, called variously desk set box, bell box, subscriber set, or just subset. This box is typically mounted on a wall or desk-side, and contains an electromagnetic bell ringer and a speech transformer , called induction coil , to connect the ...
The housing of the bell box may be manufactured from wood, metal, or plastic. The basic core component of a conventional bell box is an electromagnet and a bell or other metal piece, some of which create a repetitive sound. [1] The bell sound is normally created inside the box, although the unit may have bells mounted on the outside of the box.
The Western Electric model 500 telephone series was the standard domestic desk telephone set issued by the Bell System in North America from 1950 through the 1984 Bell System divestiture. The successor to the model 302 telephone , the model 500's modular construction compared to previous types simplified manufacture and repair and facilitated a ...
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