[1][2] DAS Companies purchased the rights for Astatic Citizens Band hand microphones and is one of their acquired brand names.

Their mutual friend, Charles Semple, worked for Brush Development Company where he had been experimenting with Rochelle salt crystals.

Semple demonstrated some crystal pick-ups that Brush was working with, leading Chorpening and Woodworth to found The Astatic Microphone Laboratory, Inc. in Youngstown, Ohio in 1933.

[4] In early 1944, Astatic moved operations to Conneaut, Ohio and supplied microphones, pickups and crystal cartridges as well as hydrophone and sonar devices to the military during World War II.

DAS expanded the Astatic name to non-microphone accessories including coaxial cables, meters and antennas.

[8] Many players modify them by putting in Shure Controlled Magnetic Transducers after the original elements fail.

[6] Introduced in 1933, the Astatic model D-104 became known for its high frequency response that contributed to better communications audio quality.

Early D-104 mikes used a 1" thick case, a large ID tag, and holes for "ring & spring" mounts.