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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 ...
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).
SPX 2000 small digital telephone exchange (rural) Siemens Gigaset cordless telephones (19% share, Gigaset was sold to Arques Industries) ... (For Electrical Power ...
A payphone (alternative spelling: pay phone or pay telephone or public phone) is typically a coin-operated public telephone, often located in a telephone booth or in high-traffic public areas. Prepayment is required by inserting coins or telephone tokens , swiping a credit or debit card, or using a telephone card .
12 November 1877: The first commercial telephone company enters telephone business in Friedrichsberg close to Berlin [26] using the Siemens pipe as ringer and telephone devices built by Siemens. 1877: The first experimental Telephone Exchange is established in Boston. 1877: First long-distance telephone line
The W48 is the successor of the pre-war Modell 36 and the W38, with only a few modifications.The principle design features were based on the "classic" W28, the first widely distributed desktop telephone developed by the Siemens & Halske company and built in license for the German Reichspost from 1928 by several manufacturers.
NASA's Johnson Space Center (JSC) in Clear Lake, TX was the push behind the 9000 series, with JSC eventually having a 13 node 9000VLCBX on its campus (replaced by a Siemens 9006i and later a Siemens HiPath switch). The various models of IBM produced ROLM 9751 CBX are 10, 20, 40, 50 & 70.
AN/TTC-20 568 Line Military Fixed Switch (Used by US Air Force - only one was known in existence at Sembach AB, Germany) (retired) AN/TTC-30 568 Line Military Tactical Mobile Switch (Used by US Army and Air Force) (retired)
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