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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. Field telephone - Wikipedia

   en.wikipedia.org/wiki/Field_telephone

   Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones. Telephone linesmen ford Lunga River during the Guadalcanal Campaign of World War II

4. Talker helmet - Wikipedia

   en.wikipedia.org/wiki/US_Navy_Mk_II_talker_helmet

   The talker helmet or phone-talker helmet is a combat helmet used by the United States Navy and United States Coast Guard.It was originally designed in 1942 as a special-purpose naval helmet for deck crews that could fit additional equipment the contemporary M1 helmet was incompatible with, such as a sound-powered telephone headset.

5. Telephone - Wikipedia

   en.wikipedia.org/wiki/Telephone

   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.

6. Portal:Telephones - Wikipedia

   en.wikipedia.org/wiki/Portal:Telephones

   A sign in the US restricting cell phone use to certain times of day (no cell phone use between 7:30–9:00 am and 2:00–4:15 pm) (from Mobile phone) Image 42 The LG Prada with a large capacitive touchscreen introduced in 2006 (from Smartphone )

7. This top-selling soundbar has over 15,000 fans — and it's ...

   www.aol.com/lifestyle/this-top-selling-soundbar...

   As part of Amazon's Winter Sale, the top-selling Majority Bowfell TV Soundbar is down to only $33, from $40. This incredibly affordable, wildly popular model has a five-star rating from nearly ...