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This mid- to late-1950s telephone dial displays the name of telephone exchange Kenmore, in the South Side of Fort Wayne, Indiana. The telephone number of this station is K-9293. Since the letter K is emboldened, it was a required component of the telephone number, dialed as the digit 5, as the red lettering indicates.
For most cities, this conversion required the addition of extra digits or letters to the existing central office prefix. For example, the Atlantic City, New Jersey, telephone number 4-5876 was converted to AT4-5876 during the 1950s. Complete replacement of existing prefixes was necessary in the case of conflicts with another office in the state.
The Australian letter-to-number mapping was A=1, B=2, F=3, J=4, L=5, M=6, U=7, W=8, X=9, Y=0, so the phone number BX 3701 was in fact 29 3701. When Australia around 1960 changed to all-numeric telephone dials, a mnemonic to help people associate letters with numbers was the sentence, "All Big Fish Jump Like Mad Under Water eXcept Yabbies."
Until the 1950s, a typical telephone number in the United States and many other countries consisted of a telephone exchange name and a four- or five-digit subscriber number. The first two or three letters of the exchange name translated into digits given by a mapping typically displayed on the telephone's rotary dial by grouping the letters ...
All-figure dialling was a telephone numbering plan introduced in the United Kingdom starting in 1966 that replaced the traditional system of using initial letters of telephone exchange names as the first part of a telephone number. [1]
The letter Z appeared on many telephone dials from the early 1930s to the 1950s at the same position as the label Operator with the digit 0, indicating that the caller had to call the operator to place the call. The operator looked up the Zenith number to find the corresponding city and directory telephone number, and completed the call by ...
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Telephone with letters on its rotary dial (1950s, UK) The layout of the digit keys is different from that commonly appearing on calculators and numeric keypads. This layout was chosen after extensive human factors testing at Bell Labs. [3] [5] At the time (late 1950s), mechanical calculators were not widespread, and few people had experience ...