Original oil and gas trade magazine vintage ad for BLACK, SIVALLS & BRYSON, INC. Mass Flowmeter on display at Tulsa oil show. Jointly developed by B S and B and General Electric for measurement of natural gas flow by actual mass or weight, and a completely new type of tank made from a spiral wound continuous glass filament. This unique 1959 old petroleum refining and process industry magazine advertisement would display beautifully matted and framed.