Original oil and gas trade magazine vintage ad for THORNHILL-CRAVER COMPANY. Main office was located in Houston, TX. Unibolt Christmas Tree Flow Manifold is your best buy. You buy only what you need. Using three standard products, Tee, Adjustable Wing Valve, and Positive Choke Boy, you have the choice of several combinations. This unique 1959 old petroleum oilfield equipment industry magazine advertisement would display fabulous matted and framed.