Original oil and gas trade magazine vintage ad for MID-CONTINENT SUPPLY COMPANY of Fort Worth, TX. Air drilling units use exclusive rock-over trailers. Packaged compressor units mounted on patented Rock-Over trailer are available complete with controls, heat exchanger equipment, scrubbers, and piping. Furnished with either gas or diesel engine power. Shown are the road and operating positions. This unique 1962 old oilfield petroleum drilling industry equipment advertisement would display fabulous matted and framed. Two page gatefold advertisement.