Original oil and gas trade magazine vintage ad for SOUTHWEST INDUSTRIES INC. of Houston, TX. Designs, Engineers and Builds Packaged Gas Compressor Plants in Its Own Shops At Houston, Texas. Ohio Oil Company., M.L. Mayfiled, Sun Oil Company, Amerada Petroleum Company and Phillips Petroleum Company. Partial view of Southwest shops in Houston. Unique 1955 old petroleum oilfield compressed gas industry equipment magazine advertisement, Approximate size 9 x 12 inches.