1
Ben W O Dickinson III, Robert W Dickinson, Richard R Jensen, Sherman C May, Charles S Mackey, Robert D Wilkes Jr, Paul S Turin: Hydraulic drilling apparatus and method. Ben Wade Oakes Dickinson III et al, Flehr Hohbach Test Albritton & Herbert, November 29, 1988: US04787465 (39 worldwide citation)

Hydraulic drilling apparatus and method suitable for use in a variety of applications including the drilling of deep holes for oil and gas wells and the drilling of vertical, horizontal or slanted holes, drilling through both consolidated and unconsolidated formations, and cutting and removing core ...


2
Ben W O Dickinson III, Robert W Dickinson, Richard R Jensen, Sherman C May, Charles S Mackey, Robert D Wilkes Jr: Hydraulic drilling apparatus and method. Ben Wade Oakes Dickinson III, Robert Wayne Dickinson, Flehr Hohbach Test Albritton & Herbert, December 13, 1988: US04790394 (29 worldwide citation)

Hydraulic drilling apparatus and method suitable for use in a variety of applications including the drilling of deep holes for oil and gas wells and the drilling of vertical, horizontal or slanted holes, drilling through both consolidated and unconsolidated formations, and cutting and removing core ...