Original oil and gas trade magazine vintage ad for LINK-BELT COMPANY of Indianapolis, IN. Best features Spherical Roller Bearing with modern design. Big, mirror smooth convex rollers plus heavy, broad shouldered inner race plus centrifugally cast bronze, precision machined retainer. This unique 1959 old oilfield petroleum drilling industry equipment magazine advertisement would display beautifully matted and framed. Nice graphics. Two page gatefold.