perspective view of bell telephone of Pennsylvania from the northwest. This switching hall, built in 1890, was designed by Frederick j. osterling. Other Bell Telephone buildings on the block include the twenty-story headquarters building (1923, james t. windrim) on the left, and an eleven-story building (1905, alden and Harlow) on the right. - Bell Telephone of Pennsylvania Building, 416-420 Seventh Avenue, Pittsburgh, Allegheny County, PA; Osterling, Frederick J.

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Photo credit: © Tango Images / Alamy / Afripics
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