Electric Telegraph Company was created in 1846.
Electric Telegraph Company ended in 1855.
Atlantic Telegraph Company was created in 1856.
Universal Private Telegraph Company was created in 1860.
United Wireless Telegraph Company was created in 1906.
Great Northern Telegraph Company was created in 1869.
The American Telephone and Telegraph Company was created in 1885
The Western Electric Company was originally part of the Western Union Telegraph Company
The non-electric telegraph was invented in 1794 by Claude Chappe
Electric Time Company was created in 1928.
Westinghouse Electric Company was created in 1999.
Bryant Electric Company was created in 1888.
Emerson Electric Company was created in 1890.