Telephone Rotary Dial
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An illustration of the rotary dial on phones. Each hole corresponds to the number shown. To dial the number, the person will insert the finger into the phone and turn the dial until the finger hits the metal stop.
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Telephone and Telegraph IndustrySource
Encyclopaedia Britannica (12th ed., vol. 32) (New York, NY: The Encyclopaedia Britannica Company, 1922)
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