mechanical parts a variety of colors and shapes knobs, buttons, and switches a power cord or battery pack a control panel or display screen a motor or other engine conveyor belts, chains, or pulleys sensors or detectors
machine which has mechanical parts machine which is a variety of colors and shapes machine which has knobs, buttons, and switches machine which is a power cord or battery pack machine which is a control panel or display screen machine which is a motor or other engine machine which has conveyor belts, chains, or pulleys machine which has sensors or detectors