Basler Electric

Basler Electric is a manufacturer of power systems products based in Highland, Illinois. The company was founded in 1942 by Carl Basler. 
In 1945, they began producing custom transformers. In 1959, Basler released the SRA voltage regulator.
They also manufacture solid-state and multifunction digital protective relays, generator and engine controls, and static excitation systems.
Notes and references.
1. Facilities / Capabilities Report - Basler Electric Company 03-2010