Brush Development Company was a manufacturer of audio, phonographic products and magnetic recording technologies located in Cleveland, Ohio.
The business was founded in 1919 by Alfred L. Williams as Brush Labs to develop products that used piezoelectric crystals.
[1] Associates spun off the Brush Development Company in 1930 with piezoelectric phonograph pickups as its main product.
[2] Later it began manufacturing wire recorders, microphones, and speakers.
Audio products continued to be sold under the Brush trademark until 1960.