Lapping machines; Mining machines; Washing machines for clothes; Puddling machines; Compressing machines; Packing machines under vacuum; Hot adhesive guns; Piston rings; Engine cylinders for vehicles; Catalytic converter units for vehicle exhausts; Electric pumps; Electric sweepers; Electrical ultrasonic cleaning units for jewelry, coins, metal instruments, and metal tools; 3D printers; Cordless vacuum cleaners; Power-operated sprayers; Electronic feeders for animals; Power-operated polishers...