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[5] Meanwhile, a 1960 paper – just five years later – refers to today's common calculator layout as "the arrangement frequently found in ten-key adding machines". [3] In any case, Bell Labs' testing found that the telephone layout with 1, 2, and 3 on the top row, was slightly faster in use than the calculator layout with them in the bottom row.
The first tube shaft candlestick telephone was the Western Electric #20B Desk Phone patented in 1904. [1] In the 1920s and 1930s, telephone technology shifted to the design of more efficient desktop telephones that featured a handset with receiver and transmitter elements in one unit, making the use of a telephone more convenient.
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 ...
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Martin Cooper, a former general manager for the systems division at Motorola, led a team that produced the DynaTAC 8000X, the first commercially available cellular phone small enough to be easily carried, and made the first phone call from it. Martin Cooper was the first person to make an analog cellular mobile phone call on a prototype in 1973.
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.
Ericsson introduced a push-button version of the Ericofon, the model 700, for the company's 100th anniversary in 1976. The model 700 had a squarer design than earlier models. It was not a touch-tone phone. Instead, its electronics generated electrical pulses as its buttons were pressed, simulating the pulses produced by a rotary dial.
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