3D printers; 3D printing pens; Drilling machines for metalworking; Electroplating machines; Engraving machines; High frequency motor spindles with high frequency electric converters and power supply units; Industrial robots; Laser engraving machines for woodworking; Power-operated grass/weed trimmers; Power-operated grinding wheels; Power-operated rivet guns; Power hammers; Starter motors; Starters for motors and engines; Vacuum pads for vacuum pump machines