Word: step-by-step
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...Alexander Graham Bell invented the telephone in 1876. Some 3,000 patents for machine-switching devices have been filed in the U. S. alone. Out of all these patents, two main systems have evolved, the step-by-step and the panel.* The telephone subscriber cannot tell the two systems apart; the dials and the act of dialing look identical. But in the step-by-step system the mechanical combination necessary to ring the desired number is built up directly, by separate impulses from the dial. In the panel system, a more complicated mechanism (in panels) receives...
...step-by-step dialing system is based on Inventor Almon B. Strowger's patents of 1891. These patents were developed and exploited by Automatic Electric Inc., manufacturers of Strowger Automatic Dial Systems...