3D printers; 3D printing pens; Air powered tools, namely, drills, screwdrivers, rivet hammers and saws; Biodiesel-generation machines, namely, mixing equipment, pumps and heaters; Electric lawn mowers; High-pressure pumps for washing appliances and installations; Machine parts that heat and maintain temperature in machine piping systems, namely, steam jacketing, electrical tracing, and insulation sold as integral components of finished machines; Pond and water garden aeration systems comprisi...