Machinery for molding or retreading pneumatic tires and for forming inner tubes is specifically captured under 847751, distinguishing it from the broader NESOI molding and forming group at 847759. Retreading equipment should be classified under 847751 provided it is designed for that dedicated function.

A combined extrusion-blow-molding machine is a common configuration in plastic bottle production. Classification follows the machine's principal function; if the extrusion and blow-molding stages are integrated into a single machine, it typically classifies under 847730 (blow-molding machines) based on the finished-product function. A binding ruling from CBP is advisable for complex multi-stage equipment.