Oil and gas drilling apparatus, namely, drill collars, integral blade stabilizers, stabilizer mandrels, measurements-while-drilling housings, logging-while-drilling housings, non-magnetic drill collars, integral blade non-magnetic stabilizers, non-magnetic flex collars, and parts and fittings for all the aforesaid goods

Common metals and their alloys; steels; steel pipes and tubes; steel sheets and strip; metal and steel articles, namely, forged metal articles and machined metal articles for drilling apparatus; metal drill collars; and parts and fittings for such metal and steel articles and metal drill collars, namely, metal rings, metal rolls, metal shafts, metal gear wheels, metal tubes, metal flanges, metal blanks and metal mandrels