Lapping machines; Washing machines for clothes; Compressing machines; Packing machines under vacuum; Hot adhesive guns; Piston rings; Electric pumps; Electric sweepers; 3D printers; Power-operated sprayers for insecticides; Electronic feeders for animals; Power-operated polishers; Chain saws; Compressors for dehumidifying machines; Electric coffee grinders; Vacuum cleaners; Electrical ultrasonic cleaning units for jewelry, coins, metal instruments, and metal tools