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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.
A man talks on his mobile phone while standing near a conventional telephone box, which stands empty. Enabling technology for mobile phones was first developed in the 1940s but it was not until the mid-1980s that they became widely available. By 2011, it was estimated in Britain that more calls were made using mobile phones than wired devices. [1]
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.
Landline use soars from the mid-1900s until 2000. In the 1960s, owning a home phone was still a pricey affair. In 1968, a 3-minute cross-country call would cost around $18 in today's dollars ...
In phones connected to common battery exchanges, the ringer box was installed under a desk, or other out of the way place, since it did not need a battery or magneto. Cradle designs were also used at this time, with a handle with the receiver and transmitter attached, separate from the cradle base that housed the magneto crank and other parts.
Beginning in the early 1950s, 500-style phones were also made under license by ITT Kellogg (now Cortelco), who continued manufacturing the original rotary design, marketed as the Cortelco ITT-500AS (desk phone) and Cortelco ITT-554AS (wall phone), until discontinuation on January 1, 2007.
Over the next decades, colour television were invented, showing images that were clearer and in full colour. 1914: First North American transcontinental telephone calling; 1927: Television. See: History of television; 1927: First commercial radio-telephone service, U.K.–U.S. 1930: First experimental videophones
1970s: Public-key cryptography is invented and developed by James H. Ellis, Clifford Cocks, Malcolm J. Williamson, Whitfield Diffie, Martin Hellman, Ralph Merkle, Ron Rivest, Adi Shamir, Leonard Adleman, et al. 1970: The pocket calculator is invented. 1971: The first single-chip microprocessor, the Intel 4004, is invented.