7 Machines for use in oil and gas industries namely, a wireline maintenance system for subsea wells comprised of valves to shut off flow from the well in the event of a leak, machine tools that can be selected and deployed individually into the well on wireline, and a winch with a supply of electric wire to deploy tools into the well, to power the tools and to transmit data from the tools; Machine tools, namely, plugs, packers, setting tools, production logging tools, calipers and perforating guns, and parts and fittings therefor