The Pacific Rolling Mill Company was the West’s first iron and steel producing foundry, founded in 1866, in San Francisco, California. (The company was also known as Pacific Rolling Mills and the two names were used interchangeably throughout its history.) Later in its life, through mergers, the company was transformed first into the Judson-Pacific Company, and then into Judson Pacific-Murphy Corporation. In its various guises, Pacific Rolling Mills has produced steel used during the construction of numerous famous buildings and landmarks in the West as well as a number of notable battleships.