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A screensaver (or screen saver) is a computer program that blanks the display screen or fills it with moving images or patterns when the computer has been idle for a designated time. The original purpose of screensavers was to prevent phosphor burn-in on CRT or plasma computer monitors (hence the name). [ 1 ]
Because this tied-up the subscriber's line, incoming calls could not be received while listening to the Electrophone, although operators were instructed to break-in in case of emergency. The rare home that had two telephone lines could use one to receive the Electrophone service, and the other to call the operators to change their selection. [14]
The telephone played a major communications role in American history from the 1876 publication of its first patent by Alexander Graham Bell onward. In the 20th century the American Telephone and Telegraph Company (AT&T) dominated the telecommunication market as the at times largest company in the world, until it was broken up in 1982 and replaced by a system of competitors.
11 February 1876: Elisha Gray invents a liquid transmitter for use with a telephone, but he did not make one. 14 February 1876 about 9:30 am: Gray or his lawyer brings Gray's patent caveat for the telephone to the Washington, D.C. Patent Office (a caveat was a notice of intention to file a patent application.
The following is a brief summary of the history of the development of the telephone: Antonio Meucci's telephone. Reis's telephone around 1861, first device called telephone [24] A French Gower telephone of 1912 at the Musée des Arts et Métiers in Paris
It's been 14 years since Apple launched the first iPhone, drastically altering the cell phone landscape. Here's how the iPhone has changed since. History of the iPhone: How Apple's signature ...
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In 1936, the hangup-type hand telephone set was redesigned as the type G handset mounting to produce the 211 anti-sidetone telephone, as well as a series of other types (212, 213, 214) for special service modifications. This type of telephone set was produced well into the 1970s, and is often colloquially referred to as a space-saver telephone.