heat transfer units consisting of plates or tubing so embossed or extruded as to contain internal passes or fluid flow directors, and used in marine engines or internal marine boat on-board processes; heat transfer units, namely, cooling systems, heating systems, and temperature management systems for industrial and marine use; heat exchangers not being parts of machines; heat exchangers for vessels also known as keel coolers; machines, namely, heat exchangers and heat transfer units; externa...