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That sort of wiring was used on the underside of telegraph instruments and other early electrical devices, before radio. In many cases, where the wooden base was to sit right on the table with no legs to elevate it, grooves were knifed into the wood and the bare wire was embedded in it so a smooth bottom surface was presented. Sometimes that would be entirely covered with felt.
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Reece
Perfection is hard to reach with a screwdriver.
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