Exemption for original equipment parts in stationary diesel engine manufacture subject to officer certification and procedural compliance. Exemption covers specified goods when used as original equipment parts in the manufacture of stationary diesel oil operated I.C. engines, subject to proof to an officer not below Assistant Collector that the goods are intended as such (excluding components specially configured for transport prime movers) and compliance with Chapter X procedures where the goods are used outside the factory. The Table enumerates the covered components including valves, gaskets, nozzles, pistons, rings, gudgeon pins, circlips and filter elements.