Original oil and gas trade magazine vintage ad for MANNING, MAXWELL & MOORE, INC. of Watertown, MA. Hancock Steel Valves provide the dependable protection demanded for every process application. Shown is the Type 950 valve widely used by the processing and power industries. This unique 1962 old oilfield petroleum industry equipment magazine advertisement would display beautifully matted and framed. Nice graphics. Two page gatefold advertisement.