Original oil and gas trade magazine vintage ad for FRITZ W. GLITSCH & SONS, INC. Main office was located at 4900 Singleton Boulevard, Dallas, TX. Ballast Valve Tray design give greater turndown ratio, overall operating efficiency. Designed to function as a variable orifice and thereby provide a staging of the vapor through the various rates of flow. This unique 1959 old petroleum refinery equipment industry magazine advertisement would display beautifully matted and framed.