Original oil and gas vintage magazine ad for JOHN N. MARTIN in Tulsa, OK. Correct ring fit is easy with Martin plungers and method of installation. The gaps between the rings cause fluid turbulence which slows down slippage past the plungers. Main office was located at 9 W. Brady. This 1959 unique old one page petroleum oilfield drilling equipment trade advertisement would display beautifully matted and framed.
- SKU zd963
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