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  2. Rotary dial - Wikipedia

    en.wikipedia.org/wiki/Rotary_dial

    A 1931 Ericsson rotary dial telephone without lettering on the finger wheel, typical of European telephones. The 0 precedes 1. A rotary dial typically features a circular construction. The shaft that actuates the mechanical switching mechanism is driven by the finger wheel, a disk that has ten finger holes aligned close to the circumference.

  3. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...

  4. Lineman's handset - Wikipedia

    en.wikipedia.org/wiki/Lineman's_handset

    Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use. Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits. Older telephone linemen also referred to the handset as ...

  5. Trimphone - Wikipedia

    en.wikipedia.org/wiki/Trimphone

    Another problem with the dial version of the Trimphone was its light weight; 0.8 kg compared with 1.4 kg for the 700-type and 2.6 kg for the 300-type telephone. This led to the complaint that on slippery surfaces the telephone turned and slid whilst dialling. The fix for this was to wet the feet and the phone stuck to the table.

  6. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    Telephone sets could be either rotary dial models, or be equipped with Touch-Tone keypads. A power supply was either mounted within the panel or separately nearby. The power supply provided 24 VDC for relay operation, filtered 24 VDC for talk battery (intercom and direct-line services), 10 VAC for lamps, 18 VAC for buzzers, and 90–110 VAC at ...

  7. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    In early cell phones, or feature phones, the letters on the keys are used for text entry tasks such as text messaging, entering names in the phone book, and browsing the web. To compensate for the smaller number of keys, phones used multi-tap and later predictive text processing to speed up the process.

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