Original oil and gas trade magazine vintage ad for GROVE VALVE and REGULATOR COMPANY.  A subsidiary of Walworth. Main office was located at 65th and Hollis Street, Oakland, CA. Never Stuck with Seal-O-Rings. No valve failure because of forgotten lubricant or depleted sealing compound. This unique 1959 old oilfield petroleum well industry magazine advertisement would display beautifully matted and framed.