Original oil and gas trade magazine vintage ad for THORNHILL-CRAVER COMPANY. Main office was located in Houston, TX. Unibolt Flow Manifolds any way you like them. Shown are half a dozen of the most popular arrangements. They range from low-cost low-pressure threaded connections to low-cost high-pressure flanged connections. The Wing Valve may also be used as an Adjustable Choke. Never needs lubricating and may be completely and inexpensively overhauled in the field. This unique 1959 old petroleum oilfield industry equipment magazine advertisement would display beautifully matted and framed.