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Hyponyms: answering machine, beeper, pager, defibrillator, display, display adapter, display adaptor, dongle, doubler, generator, hearing aid, deaf-aid, logic element, mouse, computer mouse, multiplexer, pacemaker, artificial pacemaker, personal digital assistant, PDA, personal organizer, personal organiser, organizer, organiser, repeater, scanner, digital scanner, image scanner, system clock, trackball, tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve