Original oil and gas trade magazine vintage ad for MISSION MANUFACTURING COMPANY. of Houston, TX. Valve that thinks for itself. Oilfield industry equipment including pistons, liners, swabs. The higher the pressure, the more tightly the valve seals. Pressures force sealant through two semi-circular grooves around the downstream port, forming a gas-tight seal. Leaks are stopped before they can start. This unique 1959 old oilfield petroleum well valve equipment magazine advertisement would display beautifully matted and framed. Nice graphics.