The Corcoran Lamp Company was started by Thomas H. Corcoran after the civil war in Cincinnati, OH.
They made carriage lamps. At one point they were considered the largest lamp manufacturer in the US.
Thomas H. had 5 sons and 3 daughters. The oldest was my great grandfather, Thomas J.
Other siblings were John L, Edward B, George, William J, Alice, Jenny, and Mary
Thomas J. took over the Carriage lamp business in the late 1800's and in 1905 he discontinued marketing to the carriage lamp industry and focused on manufacturing auto lamps.
William Corcoran (brother of Thomas J) started Corcoran Manufacturing Co. They produced aftermarket products for Ford, Chev and others. One of their brands was "Peerless".
Edward started the Victor Lamp Co. and was a competitor of Corcoran Lamp until Thomas J bought out his brother around 1918. The company became Corcoran-victor Lamp Co.
Corcoran Lamp Co had 2 plants. One plant in Cincinnati and one in Detroit. After the Detroit plant closed, (early teens I believe), William Durant, a friend of Thomas J, assembled the first Chevrolet in the Corcoran plant.
In the '20s, the company reverted to "Corcoran Lamp Co, dropping Victor from the name. Corcoran then bought out Jno. Brown Lamps in Columbus Oh. Not sure of the date but the company became Corcoran-Brown and continued under that name until the early 1940's when the company was sold to "Electric Auto Lite". During the 40's, Corcoran-Brown produced a large variety of lamps for the military. Thomas J died in 1940.