1926 - Charles Brush sold the first piezo-electric featherweight stylus.

1938 Semi J. Begun (born in Hungary) of C. Lorenz company leaves Germany to start a new career in the United States. Lorenz is then owned by US capital. In 1939 he takes a job at the Brush Development Company of Cleveland, Ohio. There Semi Begun has developed the Soundmirror steel tape recorder in early 1939 that would be used by the military.

But in Germany modern red oxide tape has been used in 1939. Bell / Western Electric stereo recordings LEF Independently, engineers in Germany, Japan and the U.S. discover and develop AC biasing for magnetic recording.

Brush Development Company's main business in 1943 was the production of piezo electric phonograph pickups, the least expensive and most widely used pickup of the late 1930's - besides other activity. During the war Brush works on a substitute for the stainlesss steel wire phonographs. Then Brush, Ampex, 3M (Tape material) and others work on tape recorders. The singer Bing Crosby and Mullin (Ampex) were the motors for tape recording in the USA.

During WW2 S.J. Begun develops steel tape and coated-paper tape recorders. Between 1942 and 1945 the company designs and successfully sells to the military various types of recorders utilizing plated media in the form of tapes, disks, and wire. At the End of war many Magnetophons of the German are taken to USA. German patent rights on the technology are seized by the U.S. Alien Property Custodian.

1946: Brush Development Corp. builds a semi-professional tape recorder as its Model BK-401 (BK401) Soundmirror. The Brush Development company introduces its Soundmirror paper tape recorder developed in 1939-40. The Shellmar company manufactured the paper magnetite tape in 1946 for the Brush Soundmirror tape recorder and also a 5-inch magnetic disk for the Brush Mail-A-Voice disk recorder that sold for only $40.
A Brush licensee, Amplifier Corporation of America, introduces the Magnephone tape recorder.

Between 1952 and 1954 according to SAMS Photofacts the company name "The Brush Development Company" has been changed to "Brush Electronics Company". The company stayed at the same address: 3405 Perkins Avenue, Cleveland 14, Ohio.