Rauser 1930
Filed: February 12, 1930
G.B. Patent 348,573
Granted: May 12, 1931
Albert Rauser and Wilhelm Steuer, of Kottbuser-Ufer 39/40, Berlin, S.O. 26
"Improvements Relating to Electrostatic Loud-speakers".
Referenced by Walker and Williamson in U.S. Pat. 3,008,014