| 摘要 |
A device for backlighting a plastic panel associated with a control knob and carrying indicia thereon for illumination by an electroluminescent panel under the plastic panel containing the indicia with the electronic circuitry for illuminating the electroluminescent panel being contained within the hollow control knob. A light-responsive device may be used to maintain the circuit in the OFF position until the ambient light intensity fails below a predetermined level.
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