-
-
-
-
-
-
Expendable diamond drag bit
-
Patent number 4,813,500
-
Issue date Mar 21, 1989
-
Smith International, Inc.
-
Kenneth W. Jones
-
E21 - EARTH DRILLING MINING
-
-
-
-
Expendable diamond drag bit
-
Patent number 4,719,979
-
Issue date Jan 19, 1988
-
Smith International, Inc.
-
Kenneth W. Jones
-
E21 - EARTH DRILLING MINING
-
-
-
Oil well drilling bit
-
Patent number 4,420,050
-
Issue date Dec 13, 1983
-
Reed Rock Bit Company
-
Kenneth W. Jones
-
E21 - EARTH DRILLING MINING
-
-