Original oil and gas trade magazine vintage ad for MANNING, MAXWELL & MOORE, INC. of Watertown, MA. Try One In The Line And You'll See Why Specifying Hancock Bronze Valves Means Big Savings In Your Valve Investment. Pictured is a Hancock 500 Brinell Bronze Valve. Unique 1955 old oilfield petroleum valve industry magazine advertisement. On the reverse side is an ad for THE TIMKEN ROLLER BEARING COMPANY of Canton, OH. Steel and Tube Division. Specialists In Fine Alloy Steels, Graphitic Tool Steels and Seamless Tubing. To Get The Best Possible Tube Life Per Dollar Ask The Experts! Shown is the flattening test of 10 1/2" O.D. by 1.580" wall of 18-8 Cb showing the excellent ductility of large, heavy-wall Timken high temperature steel tubing. Also a report on Sicromo 7. Unique 1955 old petroleum industry equipment magazine advertisement. Approximate size 9 x 12 inches. Scanned image shows a pinkish tint, not on the actual ad.