Overview

• Building Type: office building
• Client: Keystone Telephone Co.

Location

135-139 S 2ND ST [Browse this block]
Philadelphia, PA

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Historic Registrations and Surveys

• Philadelphia Register of Historic Places
• HABS (Historic American Building Survey): PA-1406

Comments

World's first automatic telephone exchange (1902-1944)

Links to Other Databases

• Historic American Buildings Survey (HABS): PA-1406
• PHMC Cultural Resources Database
• PhillyHistory.org - find historic photos near this building

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