Testing cars for motor knocks, Southern California, 1935

5 photographs of men testing cars for motor knocks, Southern California, 1935. "Subject: Testing cars for motor knocks, 8x10 also; Client: Marion Oil Co[mpany]; Original Print Order: 1 ea[ch], 1 ea[ch]; Size: 8x10, 5x7, 8x10, 8x10, 8x10, 8x10, 8x10; finish: gl[ossy], file; Mount: prints; Re-Order: 2# 1,2,5, 3 #4, 4 #3, 3 #5, 1 #1,3,5; Job: 5-7-51; Year: 1935" -- on envelope front. "Operator's Report Name: "Dick"; 12 Original Photographs-Size 8x10; Amount: 37.50; Extra Charges: Badger" -- on envelope back.