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VTech Holdings Limited (an abbreviation of Video Technology Limited or simply VTech) is a Hong Kongese company of children's electronic learning products. [5] [6] [7] It is the world's largest manufacturer of baby monitors and cordless phones. [5] [6] [7] It was founded in October 1976 by Allan Wong (Chi-Yun) [1] [2] and Stephen Leung. [3]
Radio telephony (telephony without wires) predated cordless phones by at least two decades. The first, MTS, or Mobile Telephone Service went into service in 1946. Because the range was intended to cover the widest possible service area, capacity was extremely low, and the early tube technology made equipment rather large and heavy.
A typical Western Electric hand telephone set of c. 1930. It consists of a handset mounting with the handset held in a cradle, and a subscriber set mounted against a wall or vertical surface in close proximity. Shown is a B1A hand telephone set, also known as the type 102B-3 hand telephone set.
This series of telephone evolved through several designs in the 1920s and 1930s, to refurbishments in the 1950s. They consisted of a table-top handset stand and a wall- or desk-mounted subscriber set that contained the components to connect the telephone to the telephone line, as well as an electromechanical bell ringer.
Renamed VTech Innovation, L.P., the former LTCP manufacturing division does business as Advanced American Telephones. Telephone production was abruptly shifted to China . Advanced American Telephones also entered a 20 licensing agreement with AT&T to use the AT&T brand on all telephones it would produce.
Phone plug mated in a phone socket. The plug's grooved tip is held firmly by the socket's spring tip contact. When not mated, this spring instead connects to the flat switch contact for detecting a plug. TS and TRS plugs of different sizes. A phone connector is a family of cylindrically-shaped electrical connectors primarily for analog audio ...
The model 554 was a wall-mounted version. Other special-purpose models included additional features. This included phones with dial lights (500U), party line sets (501), keysets (540 and 560 series), call directors, panel phones (750 series), industrial and outdoor phones (520 and 525), and automatic dialers (660).
Candlestick telephones featured a mouthpiece (transmitter) mounted at the top of the stand, and a receiver (earphone) that was held by the user to the ear during a call. When the telephone was not in use, the receiver rested in the fork of the switch hook protruding to the side of the stand, thereby disconnecting the audio circuit from the ...
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