Drilling rigs; drilling equipment and parts, namely, derricks, mast structures of metal, crown blocks in the nature of mechanical pulley blocks as parts of machines, mud systems in the nature of machines for mixing and moving mud during drilling, power systems in the nature of electric power generators for drilling rigs, pipe handling machines, mud pumps, structural, mechanical and electrical parts specially designed for electric mud pumps, drawworks in the nature of hoists, structural, electrical and mechanical parts specially designed for drawworks in the nature of hoists, travelling blocks in the nature of mechanical pulley blocks as parts of machines, structural parts for travelling block in the nature of mechanical pulley blocks, dollies in the nature of structural parts for drilling rigs, stabbing baskets in the nature of structural and mechanical parts specially designed for drilling rigs, top drives in the nature of electrical, hydraulic and mechanical equipment and parts specially designed for rotating and providing drill string torque in drilling rigs, mud production equipment in the nature of machines for producing mud on drilling rigs, solids control equipment in the nature of machines for removing solids in the mud on drilling rigs, valves as machine components, blow out preventors in the nature of structural, mechanical and electrical parts and machines specially designed for drilling rigs, iron roughnecks in the nature of electrical, mechanical and structural parts specially designed for connecting and disconnecting tubulars on drilling rigs, rotary tables in the nature of structural, mechanical and electrical machines and parts specially designed for suspending and rotating the drill string on drilling rigs, handling tools in the nature of structural, electrical and mechanical parts and machines specially designed for handling tubulars on drilling rigs, alternating current (AC) drive systems in the nature of drives for machines, silicon-controlled rectifier (SCR) systems in the nature of drives for machines, and motors not for land vehicles; drilling equipment and parts, namely, drilling instrumentation in the nature of computer systems and electro-mechanical sensors including pressure sensors, level sensors, torque sensors, proximity sensors and encoders, all sold as integral components of drilling rigs; drilling equipment and parts, namely, control systems in the nature of electrical controls sold as integral components of drilling rigs; drilling equipment and parts, namely, control systems in the nature of hydraulic controls for machines

Drilling-related computer hardware and firmware for operating and monitoring drilling equipment and mud systems, and computer software for operating and monitoring drilling equipment and mud systems

Repair, maintenance, installation and commissioning, namely, bringing into operation, of drilling rigs and drilling rig equipment; installation, maintenance and repair of drilling-equipment-related computer hardware

Design and development of drilling equipment, including drilling equipment related computer hardware and software; computer programming on drilling equipment and systems; installation, maintenance and repair of drilling-equipment-related computer software