C.B.S. recording equipment, Los Angeles, Calif., 1939

8 photographs of equipment at a Columbia Broadcasting System affiliate, probably Los Angeles, California, 1939 October. Included are microphones, a lacquer (acetate) record and recording equipment, an "On the Air" sign, program schedule, clock, and an a billboard "It's a fact. Official ARA gasoline tests, is better than 21¢ gasoline".1939年10月拍摄的8张哥伦比亚广播公司（Columbia Broadcasting System, CBS）附属电台设备照片，拍摄地点大概率为加利福尼亚州洛杉矶市。该组照片收录的内容包括麦克风、漆片（醋酸纤维）唱片及录音设备、"正在播出（On the Air）"标识牌、节目单、时钟，以及一块广告牌，其上文字为"It's a fact. Official ARA gasoline tests, is better than 21¢ gasoline"，其意可译为「此为官方ARA汽油测试结果：本品优于售价21美分的汽油」