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US2080225A
|
|
Swivel
|
|
GB349205A
|
|
Control heads for wells
|
|
GB350909A
|
|
Improvements relating to drawworks for well drilling plant
|
|
DE566512C
|
|
Winch for deep drilling devices
|
|
DE528256C
|
|
Brake for hoists of earth drilling rigs with compensation of the braking effect of the brake bands
|
|
GB344030A
|
|
Control for rotary drawworks for well-boring plant
|
|
GB343201A
|
|
Improvements relating to rotary drawworks for well drilling plant
|
|
GB343956A
|
|
Rotary machine for well-drilling and the like
|
|
DE524176C
|
|
Pipe grab with liner
|
|
DE536727C
|
|
Pipe grab, consisting of articulated segments
|
|
GB343545A
|
|
Improvements in rotary drawworks for drilling oil wells and the like
|
|
GB346687A
|
|
Spur gear rotary machine for drilling oil wells and the like
|
|
GB343162A
|
|
Improvements in or relating to swivels for well-boring apparatus
|
|
GB343886A
|
|
Improvements in or relating to drawworks for well drilling plants
|
|
GB342030A
|
|
Pipe slips for use in connection with well-drilling operations
|
|
GB336462A
|
|
Pumper
|
|
US1819193A
|
|
Rotary machine locking device
|
|
GB291049A
|
|
Two-piece drum for rotary drawworks for well drilling plant
|
|
DE489222C
|
|
Rope drum
|
|
US1909602A
|
|
Slip with removable liner
|
