SPECIFICATION FOR RATING OF STEEL HELICAL AND HERRING-BONE GEARED SPEED REDUCERS FOR PUMPING MACHINES (Fourth Edition; SUPP 1: August 1946; SUPP 2: August 1947)
This specification does not include dimensional data but does cover the torque and crank pull of helical and herringbone geared speed reducers for oil-well pumping. Nothing contained in this specification is to be construed as granting any right@ by implication or otherwise@ for manufacture@ sale@ or use in connection with any method@ apparatus@ or product covered by Letters Patent@ nor as insuring anyone against liability for infringement of Letters Patent.