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Eugene Polley (November 29, 1915 – May 20, 2012) was an electrical engineer and engineering manager for Zenith Electronics who invented the first wireless remote control for television. Life and career
Mobile radio telephone systems were mobile telephony systems that preceded modern cellular network technology. Since they were the predecessors of the first generation of cellular telephones, these systems are sometimes retroactively referred to as pre-cellular (or sometimes zero generation , that is, 0G ) systems.
A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...
Pressing a button on the pendant contacts a Life Alert call center, and a Life Alert dispatcher then contacts 9-1-1. The company requires service contract with a minimum term of three years. Some people call life alert and have them transferred to their dispatch office and a 911 operator [3]
In the 1960s, after the introduction of touch-tone service in November 1963 in various locations of the telephone network, the basic 500-type chassis was retrofitted with a new housing and face plate, and a ten-key push-button keypad. This was designated as the model 1500 telephone, and a twelve-button model 2500 was introduced in 1968.
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 early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.
Doro AB, known as Doro, is a Swedish consumer electronics and assistive technology company focused on the elderly and improving the lives of seniors. Founded in 1974 in Sweden as a challenger to the state-run telecommuncations monopoly, the company develops communications products and services designed primarily for the elderly, such as mobile phones and telecare systems. [2]