CENTEK

Drill, pipe and casing protectors of metal for use in well boring and for holding the pipes in place thereafter; control line and sucker rod protectors of metal for use in well boring and for holding the pipes in place thereafter [ ; compressible tubular products of metal, namely, collapsible tubes of metal ]

Oil field cementing equipment, namely, drilling rig mechanization machines and devices in the nature of centralisers for casing and tubing [, releasable coupling devices in the nature of couplings for machines, fluid couplings being part of machines, shaft couplings for machines, and coiled tubing connectors ]