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2. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   Modern emergency telephone powered by sound alone. 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 ...

3. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   Phone connector (audio) Phone plug mated in a phone socket. The plug's grooved tip is held firmly by the socket's spring tip contact. When not mated, this spring instead connects to the flat switch contact for detecting a plug. A phone connector is a family of cylindrically -shaped electrical connectors primarily for analog audio signals.

4. List of mobile phone brands by country - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_phone...

   Bankruptcy in 2006, defunct in 2007. Grundig Mobile. Hagenuk Telecom GmbH. insolvency in 1997, mobile phone development and manufacturing business acquired by Telital in 1998 [9] Siemens Mobile. Acquired by BenQ Corporation in 2005 to form BenQ Mobile. Telefunken. Italy. Onda Mobile Communication.

5. US Navy Mk II talker helmet - Wikipedia

   en.wikipedia.org/wiki/US_Navy_Mk_II_talker_helmet

   In 1942, the US Navy decided to commission a special helmet for sailors posted on decks and tasked with transmitting orders by sound-powered telephone.The new helmet was to protect "exposed deck personnel" and accommodate a telephone headset; furthermore, it had to be usable while wearing a gas mask and binoculars.

6. Princess telephone - Wikipedia

   en.wikipedia.org/wiki/Princess_telephone

   Princess telephones in pink, turquoise, and black are among the rarest colors of the phones and most valuable. Automatic Electric offered a lighted-rotary-dial model of similar proportions but with a rectangular, rather than elliptical, footprint, called the Starlite Phone , and later offered a non-lighted 12-key touch-tone model simply called ...

7. List of Sony Ericsson products - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_Ericsson_products

   HPM-62 stereo headset with non-removable earbuds (black) HPM-64 stereo headset included with some of the company phones, including a few walkman branded ones. This walkman branded version of this headset is also branded with BassReflex, which is a technology that improves the Bass quality. First headset with 3.5 mm jack to swap headphones.