Testing cars for motor knocks, Southern California, 1935 [image 3]
Testing cars for motor knocks, Southern California, 1935 [image 3] 
Tire testing truck at San Bernardino and Palm Springs, Southern California, 1933 [image 1]
Tire testing truck at San Bernardino and Palm Springs, Southern California, 1933 [image 1] 
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 4]
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 4] 
Stress tests for Department of Commerce, Southern California, 1931 [image 11]
Stress tests for Department of Commerce, Southern California, 1931 [image 11] 
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 7]
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 7] 
Testing cars for motor knocks, Southern California, 1935 [image 2]
Testing cars for motor knocks, Southern California, 1935 [image 2] 
Auto knock testing machine, Southern California, 1931 [image 5]
Auto knock testing machine, Southern California, 1931 [image 5] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 7]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 7] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 9]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 9] 
Auto knock testing machine, Southern California, 1931 [image 3]
Auto knock testing machine, Southern California, 1931 [image 3] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 4]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 4] 
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 1]
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 1] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 16]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 16] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 6]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 6] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 15]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 15] 
Stress tests for Department of Commerce, Southern California, 1931 [image 7]
Stress tests for Department of Commerce, Southern California, 1931 [image 7] 
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 6]
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 6] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 20]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 20] 
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 3]
Tube testing machine, Atwater Kent Radio, Southern California, 1930 [image 3] 
Night scenes at Ascot oil test run, Southern California, 1933 [image 3]
Night scenes at Ascot oil test run, Southern California, 1933 [image 3] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 19]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 19] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 12]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 12] 
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 18]
Tests in walls for cracks in plaster, Western Lathing Co., Southern California, 1931 [image 18] 
Joe Nikrent testing oils for the Pennzoil laboratories, Southern California, 1934 [image 3]
Joe Nikrent testing oils for the Pennzoil laboratories, Southern California, 1934 [image 3] 
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 5]
Hydrometer tests of triton & sludge from other oils, Southern California, 1935 [image 5] 
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