a button of a push-button switch which has associated with a lamp or lamps which can give a visual indication by illumination. The lamp circuitry or light source may be related to or independent of the button action Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=581-11-13
a button of a push-button switch which has associated with a lamp or lamps which can give a visual indication by illumination. The lamp circuitry or light source may be related to or independent of the button action