7 Drilling equipment and parts therefor, namely, casing centralizers, tubing centralizers, welded positive centralizers, rigid positive centralizers, welded-bow centralizers, close tolerance centralizers, non-welded centralizers and spiral tubing centralizers, centralizers for multiple tubing completions and centralizers for logging tools; metal downhole drilling tool machine parts, namely, casing scrapers, wall scrapers, wall wipers, cable wipers, wall scratchers, wire scratchers, stop rings, metal collars, metal stop collars, casings of metal, couplings of metal, expansion joints, casing collars, tubing collars, bows and bottom hole scrapers; and components and parts for aforesaid goods