7 Portable pipe cutting, beveling and machining systems, primarily comprising portable lathes, cutoff devices as machine tools, machine tool bits and parts for the foregoing; pneumatic power tools, hydraulic power tools and electric power tools for machining metal and plastic, namely, portable pipe beveling machines, portable lathes and cutting tools for pipe and tubing, and replacement parts for the foregoing, namely, tool bits, mandrels, mandrel ramp blocks, mandrel jaw blocks, collets, adaptors, cutting heads, tracking tools and grooving tools; hydraulic power supplies for power tools, namely, electrically powered pumps to provide hydraulic power to hydraulic motors or cylinders; pneumatic power drives which comprise pneumatic motors and adapters to interface to machine tools; electric power drives which comprise electric motors and adapters to interface to machine tools; pipe lathes, tool bits for pipe lathes, beveling and machining heads for pipe lathes, power drive heads for pipe machining tools and hydraulic power sources; machine tool bits for cutting metal and non-metal materials; machine tools, namely, portable machine tools for on-site machining and repairing of pipe flanges, tube flanges, pipe fittings, valves, vessels, heat exchangers, headers, super heaters, economizers, pumps and bases for pumps; machine tools, namely, bases for vessels, bases for heat exchangers, bases for headers, bases for super heaters, bases for economizers, and valve parts; milling machines, namely, mill slips or mills to re-surface a flat surface and slitting mills to slit plates or vessels using an end mill or a circular mill cutter; milling machines for circular cutting where the milling head is mounted on a pipe lathe fitted with a variable feed drive; end mill machines, and mill cutters; electrical orbital welding machines; parts for electrical orbital welding machines, namely, welding wire feeders, torch coolers, orbital welding heads, and orbital welding tracks