Allen-Bradley is a brand of factory automation equipment manufactured by Rockwell Automation (NYSE: ROK). With headquarters in Milwaukee, Wisconsin, it produces PLCs, HMIs, sensors, safety systems, drives, and software. Rockwell Automation also offers asset management services. Founded in 1903 as the Compression Rheostat Company, it was renamed Allen-Bradley in 1910. Rockwell International acquired it for $1.651 billion in 1985. The Milwaukee-based Allen-Bradley Clock Tower is a landmark. Allen-Bradley resistors are valued for cryogenic applications due to their unique temperature characteristics.