| http://www.w3.org/ns/prov#value | - And, except for the set switch 41, LEDs (light emitting diodes) 38a, 39a and 40a are added to the switch means 20, i.e., manual switch 38, hard switch 39 and soft switch 40, which serve as light sources which are turned on or off responsive to the operation of the corresponding switches.
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