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2. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   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 ...

3. Telephone - Wikipedia

   en.wikipedia.org/wiki/Telephone

   Some telephone systems can use external electrical power to operate ringers or amplifiers, but will revert to sound-powered communications in the event of failure of the external power supply. [24] Stations are usually connected via twisted pair wires to reduce electrical interference, and can be positioned at considerable distances from each ...

4. Field telephone - Wikipedia

   en.wikipedia.org/wiki/Field_telephone

   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.

5. Portal:Telephones - Wikipedia

   en.wikipedia.org/wiki/Portal:Telephones

   A mobile phone, or cell phone, is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones (landline phones).

6. History of the telephone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_telephone

   The master telephone patent granted to Bell, 174465, March 7, 1876. The modern telephone is the result of the work of many people. [10] Alexander Graham Bell was, however, the first to patent the telephone, as an "apparatus for transmitting vocal or other sounds telegraphically".

7. Category:Telephony equipment - Wikipedia

   en.wikipedia.org/wiki/Category:Telephony_equipment

   1A2 Key Telephone System; 20-pair colour code (Australia) 25-pair color code; ... Shoe phone; Sidetone; Sound-powered telephone; Speakerphone; Stingray phone tracker;