72096750
May 9, 1960
Apr 4, 1961
Oil Well Drilling and Servicing Tools Including [ Drill Collars, Stabilizers, ] Hole Openers, Under Reamers, Rotary Shoes, [Shale Bits,] Key Seat Cutters,[ Core Tools,] and Various Milling Cutters Inluding Whipstock Mills, Liner Mills, Liner Hanger Mills, Section Mills, Junk Mills and Tubing Mills
Yarns and Threads