Original oil and gas trade magazine vintage ad for BAKER OIL TOOLS INC. Main office was located in Los Angeles, CA. Floating Ball seals shoes and collars. It rolls with the punch of circulating fluid and cement slurry, never stationary long enough to be eroded or cut away in any one place on its continuously smooth sealing surface. This unique 1959 old petroleum oilfield drilling equipment magazine advertisement would display beautifully matted and framed.