Original oil and gas trade magazine vintage ad for OIL CENTER TOOL COMPANY of Houston, TX. New King of medium duty Casing Heads. O-C-T C-20 head design has eliminated on of the major causes of troubles. It employs a resilient seal ring which provides an effective seal automatically for the life of the well in any climate. The first and only quick-setting, positive-sealing well heads designed to eliminate open hole hazards in medium depth wells. This unique 1953 old oilfield petroleum well equipment magazine advertisement would display beautifully matted and framed. Nice graphics.