Brush Electronics Company
founded 1926
Brush Development Company was a manufacturer of audio, phonographic products and magnetic recording technologies located in Cleveland, Ohio.
"Brush Development Company," Wikipedia, http://en.wikipedia.org/wiki/Brush_Development_Company (accessed 08/28/2014) [unvetted]
"History of the radio manufacturer Brush Development Co.; Cleveland, Ohio," Radiomuseum, http://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=2092 (accessed 08/28/2014) [unvetted]