Electric Telegraph Company was created in 1846.
Electric Telegraph Company ended in 1855.
Atlantic Telegraph Company was created in 1856.
The American Telephone and Telegraph Company was created in 1885
Great Northern Telegraph Company was created in 1869.
United Wireless Telegraph Company was created in 1906.
Universal Private Telegraph Company was created in 1860.
The Western Electric Company was originally part of the Western Union Telegraph Company
The non-electric telegraph was invented in 1794 by Claude Chappe
Graybar Electric Company was created in 1869.
Hongkong Electric Company was created in 1890.
Emerson Electric Company was created in 1890.
Electric Time Company was created in 1928.