| http://www.w3.org/ns/prov#value | - In the case that an insulating material, such as plastic, wood, glass, leather, paper or the like is approached to the key, the output voltage of the oscillator 8 does not drop below the threshold of the gate 1 1, so that the corresponding input of the AND gate 12 delivers the signal L even with the insulating material in close proximity.
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