Electric caulking guns; Electric lawn mowers; Electric lawn trimmers; Electrical drills; Laser engraving machines; Pneumatic jacks; Power-operated staple guns; Power jacks; Sun-tracking and daylighting system comprised of a solar-powered mechanism for sensing the position of the sun, automatically tracking the sun and then repositioning a mirror to direct the sunlight into courtyards, outdoor spaces and open-air spaces within building structures, and/or the inside of houses or buildings; Vacu...