Apparatus for drilling holes in the ground

Apparatus for recovering core samples under pressure

Basket type core retainer

By-pass tool

Circulation reversing tool

Circulation tool

Core barrel apparatus

Core barrel for obtaining and retrieving subterranean formation

Core drilling latch assembly

Device for producing pressure pulses in an oil well fluid medium

Downhole fire control

Downhole forward and back scuttling tool

Drilling grab for pile foundations and well boreholes

Earth boring auger

Extension drilling system

Externally powered core catcher

Flow pulsing method and apparatus for the increase of the rate o

Fluid diverter tool and method

Fluid diverter tool and method

Impact tool for dislodging stuck drill bits