CRANES AND PARTS THEREOF FOR OFFSHORE AND MARINE INDUSTRIES; [ MACHINES FOR CLEANING VARIOUS TYPES OF SURFACES USING WATER PRESSURE; ] OIL WELL DRILLING EQUIPMENT-NAMELY, CHAIN TONGS, POWER OPERATED DRILL PIPE SPINNING WRENCHES; [ OILFIELD FLUID END PRODUCTS-NAMELY CHEMICAL-INJECTION PUMPS AND PARTS THEREFOR, MUD PUMP PISTONS AND PUMP LINERS; ] ELECTRIC AND DIESEL POWER GENERATORS FOR OILFIELD EQUIPMENT; VERTICAL PIPE-HANDLING EQUIPMENT HAVING [ ING ] POWER-OPERATED ROTATABLE GRIPPING HEAD STABBING BOARDS; OILFIELD CEMENTATION EQUIPMENT-NAMELY, CENTRALIZERS FOR CASING AND TUBING, CEMENT BASKETS, SCRATCHERS, WELLBORE WIPERS, AND STOP COLLARS; OILFIELD FLOAT EQUIPMENT-NAMELY, FLOAT SHOES, FLOAT COLLARS, GUIDE SHOES, BAFFLE COLLARS, AND STAGE CEMENTING TOOLS; OILFIELD CEMENTING PLUGS, DRILL PIPE/CASING PROTECTORS, CONTROL LINE AND SUCKER ROD PROTECTORS, STABILIZER SLEEVES, WIPERS FOR DRILL STRINGS, KELLY WIPERS AND THREAD PROTECTORS; PORTABLE THREAD CLEANERS FOR CLEANING THREADED CONNECTIONS OF OILFIELD TUBULARS, INCLUDING POWER DRIVE ASSEMBLY, BRUSH HOUSINGS, AND SOLVENT TANK THEREFOR [ ; OILFIELD PRODUCTION EQUIPMENT-NAMELY, WELLHEAD AND PLANT DEHYDRATORS, VERTICAL OIL TREATERS, PRODUCTION UNITS INCLUDING SEPERATORS AND HEATERS, SAND TRAPS, FREE-WATER KNOCKOUTS, AND PIGGING SYSTEMS ]

OILFIELD PRESSURE-TESTING APPARATUS FOR TESTING OF TUBULARS, BLOWOUT PREVENTORS, WELLHEADS, CHRISTMAS TREES, MANIFOLDS, LUBRICATORS, AND OTHER PRESSURE VESSELS; [ OILFIELD PRODUCTION EQUIPMENT-NAMELY, PRESSURE VESSELS, WELL-TESTING UNITS, AND METERING SEPARATORS; ] AUTOMATIC WELLHEAD PRESSURE RELIEF VALVES