Word: digit
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Dates: during 1960-1969
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...what is so complicated about long telephone numbers? Self-respecting production planners know at least 400 six-digit numbers by heart, and once the general code is known, the other digits automatically fall into place. As a matter of fact, memorizing numbers is as easy...
...Number Calling was the answer to the dilemma. Numbers appear at ten holes on a dial, and ANC gives 800 (8 times 10 times 10) possible three-digit central-office codes* an increase of nearly...
...letter code, creating exchanges like PRospect 1 up through PRospect 9, there are still only 540 combinations available. This was more than enough until Direct Distance Dialing came on the scene in 1951. The U.S. is now divided into 105 code areas, each having its own three-digit number; within any single DDD area, no two telephone numbers can be the same-and simple mathematics shows that 540 central offices are not enough for some of the more populous dialing areas...
...telephone researchers insist that over the short time it takes between looking up a number and dialing it, ANC's seven-digit numbers are just as easy to recall as those with two letters and five numbers. They admit, however, that permanently memorizing All-Number numbers takes a little more effort. An officially recommended procedure is to group the numbers into two parts, such as 571 (pause...
...Only eight of the numbers can be used for the first digit of a central office code since 0 (zero), now used to dial the Operator, is also reserved for a future person-to-person prefix; 1 will be used for station-to-station calls...