Search results
Results from the WOW.Com Content Network
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 ...
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.
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).
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.
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 Grillo telephone is a 1960s flip-phone telephone from Italy. It was designed by Richard Sapper and Marco Zanuso , and manufactured by Siemens for Italtel . Introduced in 1967, the "Grillo" remained in production until 1979, and was a popular and iconic symbol of 1960s Italian design .
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.
Gigaset AG, formerly known as Siemens Home and Office Communication Devices, is a German multinational corporation based in Bocholt, Germany. More active in the area of communications technology, it manufactures DECT telephones .