Quincy Bridge Company was created in 1866.
Quincy Memorial Bridge was created in 1928.
Quincy Bridge Company ended in 1866.
Quincy Railroad Bridge Company ended in 1903.
King Bridge Company was created in 1858.
Railroad Bridge Company was created in 1853.
Keystone Bridge Company was created in 1865.
Sibley Bridge Company was created in 1887.
American Bridge Company was created in 1900.
Keithsburg Bridge Company was created in 1881.
Pee Dee Bridge Company was created in 1911.
St. Louis Bridge Company was created in 1878.
Michigan Central Bridge Company was created in 1896.