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A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...
Gigaset Communications was established on 1 October 2008, when Arques Industries [], a private equity firm, acquired 80.2% equity interest in Siemens Home and Office Communication Devices GmbH & Co. KG (SHC) from Siemens AG for 45 million euros.
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.
Stromberg-Carlson produced several unique switching systems, including: XY, a "flat motion" switch logically similar to Strowger switching.The "XY Selector" was not invented by SC, but licensed from L.M. Ericsson of Sweden in the late 1940s and re-engineered for U.S. switching applications (Ericsson used it for PABX and a very small Rural Exchange application).
A sound-powered telephone is a telephone which transmits voice communication by wire, powered by the energy of the sound waves of the operator speaking. Principle of operation A moving-coil microphone converts the sound waves into an electrical signal, which is then converted back into sound waves at the receiver's end.
The Siemens SL45 was the first mobile phone with memory expansion and an MP3 player, [1] which debuted in late 2000. An improved version, the SL45i, was also the first phone to have a Java virtual machine .
In phones connected to magneto exchanges, the bell, induction coil, battery, and magneto were in a separate bell box called a "ringer box". 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.
A turbo generator is an electric generator connected to the shaft of a turbine (water, steam, or gas) for the generation of electric power. [ note 1 ] Large steam-powered turbo generators provide the majority of the world's electricity and are also used by steam-powered turbo-electric ships.
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