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A 1959 Western Electric model 554 wall phone, derived from the model 500 desk phone. It uses the same internal components, dial, and handset as a desk phone. Several telephone models were derived from the basic model 500, using some of the same components. The model 554 was a wall-mounted version.
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 ...
Although POTS provides limited features, low bandwidth, and no mobile capabilities, it provides greater reliability than other telephony systems (mobile phone, VoIP, etc.). Many telephone service providers attempt to achieve dial-tone availability more than 99.999% of the time the telephone is taken off-hook .
A special G-type handset, commonly referred to as GF but labeled G1, produced for the model 5302 out of Bakelite like the model 302 rather than the model 502’s plastic was completed by August 1955. It used an F1 transmitter and contained a plastic insert to allow for the use of an HA receiver, as in the 302.
Later models included the M1A ringer. The rotary dial version with ringer was known as the 702B, while the modular cord variant was labeled 702BM. The model 711B had a slide switch or push-button and was a two-line phone with exclusion on the first line. The ten-button Touch Tone version was known as the 1702B, and when twelve-button keypad ...
EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges. The modular design with connectorized cabling permits fast initial installation and growth. The system requires minimum maintenance and is particularly suitable for unattended exchanges.
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The Merlin system was originally sold in two-line, six-telephone (206); four-line, 10-telephone (410); and eight-line, 20-telephone (820) configurations. Later, there was a further 10-line, 30-telephone configuration, and with the addition of an expansion key service unit (KSU) the system could accommodate up to 30 lines and 70 telephones ...
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