Jan. 1931, n 1 p 18-23: Equipment for advertising mounted on standard touring automobile; equipment mounted on trailer for various propaganda and advertising purposes and provided with radio tuning and record-reproducing apparatus. Apr 1931, n 4 p 205-209, 13 figs: Siemens and Halske equipment of 6 and 8-watt output, carried in passenger car with supply from generators and battery driven by car engine.
Portable sound amplifier equipment
Fahrbare Klangverstaerker-Anlagen
Siemens-Zeitschrift ; 11 , n 1, 4 ; Various pages
1931
Aufsatz (Zeitschrift)
Deutsch
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