Original oil and gas trade magazine vintage ad for KENNAMETAL INC of Latrobe, PA. Frequent round-tripping caused by check valves, use Sintered Carbide Balls and Seats. Bottom-hole valving efficiency is maintained because of Kennamental's diamond-like hardness. Many fields are increasing production and lowering maintenance costs by standardizing their use. This unique 1953 old oilfield petroleum industry magazine advertisement would display beautifully matted and framed.