On This Day in Telephone History, February 12TH 1878 - The Telephone Museum, Inc.
File:RBOC lrg.jpg - Wikipedia
Bell System - Wikipedia
Telephone - Alexander Graham Bell
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Telephone History - Companies - Bell system
Bell System - Wikipedia
Telephone History - Companies - Bell system
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Bell System Property - Not for Sale
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Bell Operating Companies
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Bell Telephone Company Building Anniversary
Breakup of the Bell System - Wikiwand
RBOC (Regional Bell Operating Company) - Tech-FAQ
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Regional Bell Operating Company (RBOC) - Network Encyclopedia
Bell Operating Companies
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A very short history of US telephone regulation
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