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2. E and M signaling - Wikipedia

   en.wikipedia.org/wiki/E_and_M_signaling

   E for ear, i.e., when the near-end E lead was grounded, the far end was calling and wanted your ear. Whereas M is commonly called mouth, because when the near-end wanted to call (i.e., speak to) the far end, −48 vdc was applied to that lead. E for earth and magneto for M, from the very earliest days of telephony. An actual magneto was used to ...

3. List of instruments used in otorhinolaryngology, head and ...

   en.wikipedia.org/wiki/List_of_instruments_used...

   Katz extractor. to remove nasal foreign body. Bull's eye lamp. source of light; exiting lens is convex and produces a divergent beam of light. Speculum. to dilate orifices and to see inside. •Thudichum's nasal speculum. -do-; short blades ( uses: anterior rhinoscopy - to see the Little's area, ant-inferior part of nasal septum, anterior part ...

4. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   Headphones are also known as earphones[1] or, colloquially, cans. [2] Circumaural (around the ear) and supra-aural (over the ear) headphones use a band over the top of the head to hold the drivers in place. Another type, known as earbuds or earpieces, [1] consists of individual units that plug into the user's ear canal.

5. Motorola MicroTAC - Wikipedia

   en.wikipedia.org/wiki/Motorola_MicroTAC

   The Motorola MicroTAC is a cellular phone first manufactured as an analog version in 1989. GSM-compatible and TDMA/Dual-Mode versions were introduced in 1994. The MicroTAC introduced a new "flip" design, where the "mouthpiece" folded over the keypad, although on later production the "mouthpiece" was actually located in the base of the phone, along with the ringer.

6. Best hearing aids for seniors in 2024, according to experts ...

   www.aol.com/lifestyle/hearing-aids-for-seniors...

   The Oticon Real is an over-the-ear hearing aid that comes in two styles: behind-the-ear (BTE) with the receiver in canal (RIC) or behind-the-ear where the hearing aid hooks over the top of your ...

7. Motorola Razr - Wikipedia

   en.wikipedia.org/wiki/Motorola_Razr

   The Motorola Razr (pronounced / ˈ r eɪ z ər / like "razor") is a brand of design-oriented mobile phones manufactured by Motorola Mobility (previously Motorola, now a division of Lenovo). Its current iteration since 2019, styled motorola razr , consist of foldable smartphones reminiscent of the original Razr line of flip phones .