|
US3077936A
|
|
Diamond drill
|
|
US2709574A
|
|
Diamond drill
|
|
US2743084A
|
|
Drilling apparatus with sedimentation reservoir
|
|
US2619325A
|
|
Core disintegrating drilling tool
|
|
US2664271A
|
|
Sealing device for tubular shafting
|
|
US2715344A
|
|
Planetary gear transmission for drilling apparatus
|
|
US2664454A
|
|
Swivel electrical connection for deep well drills
|
|
US2643095A
|
|
Apparatus for drilling deep wells
|
|
US2587429A
|
|
Drag bit
|
|
US2654572A
|
|
Drilling apparatus
|
|
US2662735A
|
|
Apparatus for drilling deep wells
|
|
US2539048A
|
|
Motor-driven pumping apparatus for wells
|
|
US2609182A
|
|
Apparatus for drilling deep wells
|
|
US2463590A
|
|
Weight-carrying cable
|
|
US2500785A
|
|
Side drill with slotted guide tube
|
|
US2539047A
|
|
Side drill
|
|
US2479711A
|
|
Cartridge type seal for rotating shafts
|
|
US1951919A
|
|
Electric submergible pump unit
|
|
US1952191A
|
|
Submergible electric cable and method for making same
|
|
GB358227A
|
|
Submergible electric cable and method for making same
|
