The American Telephone and Telegraph Company was created in 1885
Atlantic Telegraph Company was created in 1856.
Electric Telegraph Company was created in 1846.
United Wireless Telegraph Company was created in 1906.
Universal Private Telegraph Company was created in 1860.
Great Northern Telegraph Company was created in 1869.
Armstrong Telephone Company was created in 1946.
Bell Telephone Company was created in 1877.
Providence Telephone Company was created in 1893.
Oriental Telephone Company was created in 1881.
Telephone Operating Company of Vermont was created in 2008.
Central Telephone Company of Texas was created in 1956.
Central Telephone Company of Virginia was created in 1971.