Knob and tube wiring

English: Knob and tube wiring was one of the earliest ways to distribute electricity throughout a building.

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  Knob, tube, and splice
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  Knob supporting a corner
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  Knob supporting a splice
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  Knob supporting a long run of wire
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  Knob serving multiple functions
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  Ceramic tubes
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  Ceramic junction for light socket
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  Splice with modern power outlet
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  Knob and tube in a 1930 home