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William G. Sanford, Michigan Bell Telephone Switchman, With Sound Machine, March 1958

William G. Sanford, Michigan Bell Telephone Switchman, With Sound Machine, March 1958 image
Published In
Ann Arbor News, March 20, 1958
Caption
RINGING MACHINE: The machine that switchman William G. Sanford is observing provides the dial tone, ringing and busy signals at individual telephones. The mechanism is alternately used with others like it to assure no interruption in the "beaming" of the three sounds.

Year
1958
Month
March
Rights Held By
Donated by the Ann Arbor News. © The Ann Arbor News.
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