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The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]
AT&T Merlin five-button telephone (voice terminal) manufactured in early 1980. AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of the Bell System in 1984, it was rebranded and later also supplied by Lucent and Avaya.
The first version of the new hand telephone sets was marked by AT&T as D-76869, a specification type for small quantities of new equipment. The device was described by George K. Thompson of the American Telephone and Telegraph Company (AT&T) in United States patent No. 1508424 of 1924, without showing the handset that was still in development. [10]
The basic design was retained, except that the handset was more rectangular in shape, and an "AT&T" badge was placed on the outside of the handset. The phone also replaced the traditional 100 series (the 2500 and 2554 telephones) for consumer use, as Lucent kept the phones because of their high demand for business use after spinning off its ...
telephone set base to handset cord: By de facto standard, this is usually a 4P4C connector. handset cord to handset: The handset end of the straight-through handset cord also uses a 4P4C connector. Some of these may be absent: Wired telephones may not have a separate base and handset.
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 ...