Original oil and gas trade magazine vintage ad for MINNEAPOLIS-HONEYWELL REGULATOR COMPANY of Philadelphia, PA. Hi-Lift Valve with micrometer indication gives greater precision in manual control of flow. Available with V-port or parabolic discs for pressures up to 600 lbs. This unique 1950 old oilfield petroleum and refining industry valve equipment magazine advertisement would display beautifully matted and framed. Nice graphics.