Original oil and gas trade magazine vintage ad for AMERICAN METER COMPANY. Main office was located in Philadelphia, PA. Gasclok power drive provides metering accuracy and economies for you. Completely self contained gas or air-powered instrument driving and timing unit for long, trouble free operation in remote locations. Versatile, accurate high torque drives. This unique 1959 old petroleum oilfield instruments and equipment magazine advertisement would display beautifully matted and framed.