3D bioprinters; 3D printers; 3D printing pens; Computerized engraving machines; Cutting machines; Cutting machines for metalworking; Engraving machines; Fiber cutting machines; Laser engraving machines; Laser engraving machines for woodworking; Laser machines for cutting, marking, and engraving fabric designed for installation directly above embroidery machines; Photo-engraving machines; Portable electric power generators; Portable laser engraving machines; Three dimensional (3D) printers