7 Heat exchangers for use as part of larger machinery; component parts of engines and motors, namely, manifolds, [ oil coolers, fuel injectors, fuel pumps, pistons, valves, crankshafts, crankpins, camshafts, flywheels, exhaust systems comprised of pipes, collector and muffler, exhaust energy recovery systems comprised of exhaust manifold, ] heat exchanger [, turbo-compressor, turbo-expander, water condenser, gas-water separator, electricity generator, and drive to main powertrain, cylinder blocks, cylinder heads; machine coupling and transmission components, except for land vehicles; 3D printing machines; machines adapted for use with 3D printing machines, namely, hydraulic injection molding machines, assembly line conveyor machinery, industrial robots, turbo machinery in the nature of electricity generators powered by turbines, micro-turbines, turbo-compressors, turbo-expanders; inking apparatus for 3D printing machines; parts and fittings for 3D printing machines; ] component parts for use in engines of [ land vehicles, ] aircraft [ and watercraft, ], namely, manifolds [, oil coolers, fuel injectors, fuel pumps, pistons, valves, crankshafts, crankpins, camshafts, flywheels, exhaust systems comprised of pipes, collector and muffler, cylinder blocks, cylinder heads ]