Original oil and gas trade magazine vintage ad for W-K-M COMPANY. Of Houston, TX. W-K-M Conduit Gate Valves. Conroe Field, Steinberger Petroleum Corporation. ASA Gate Valves, Plug and Ball Valves, Key Return Bends, Key-Kast Ally Welding Fittings, Key Pipe Joint Compounds. Division of ACF Industries. Art work by E. M. "Buck" Schiwetz of old Conroe Field, TX. Paper is of thick stock suitable for framing. This unique 1959 old oilfield petroleum valve industry equipment magazine advertisement would look sensational when matted and framed! Approximate size 9 x 12 inches.