3D printers; 3D printing pens; Door closers, electric; Door openers, pneumatic; Electric door closing system; Electric vacuum cleaners and their components; Electronic feeders for animals; Hair clipping machines for animals; Hot adhesive guns; Incubators for eggs; Motorized door locks; Pneumatic door closers; Power-operated blowers; Power tools, namely, drills; Window closers, hydraulic; Window closers, pneumatic; Window openers, pneumatic