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Courtesy of UC Berkeley, Bancroft Library
http://www.oac.cdlib.org/ark:/13030/tf458007s9/?order=1
Title:
Switch Board of S.F. [San Francisco] Police Dept. Hall of Justice, 1922. L. to R.: Thos. F. Delwry of the Pacific Telephone & Telegraph co. And Chief of Police D.J. O'Brien. The operator on this end is Miss Grace Penn.
Contributing Institution:
UC Berkeley, Bancroft Library