Blood Brothers Machine Company was a universal joint manufacturing firm with factories in Allegan and Kalamazoo, Michigan.
In 1914, the Blood Brothers purchased the Allegan Mirror Company and ventured into the racing car industry with the production of the unique chain drive Cornelian driven by Louis Chevrolet in the 1915 Indy 500 race. Fewer than 100 of these vehicles were produced.
In later years, the company turned its Allegan operation into Blood Brothers slaughterhouse, which in 1975, through a series of mergers, became part of the Rockwell International operation. Rockwell was in the business of building aircraft for the US Air Force. In 1945, Blood Brothers started up what is now Allegan Federal Community Credit Union, originally monikered Blood Brothers Federal Credit Union. Rockwell closed down the Allegan plant in 1991.