| 摘要 |
PROBLEM TO BE SOLVED: To provide a cord allowing visual and safe judgment of whether a power cord or an extension cord is disconnected or not, and visual judgement of whether electric apparatus is powered on or not without using wasteful energy. SOLUTION: This cord has a conductor covered with an insulating cover material. The insulating cover material is produced by mixing a magnetic substance and a thermally discolorable paint with a thermoplastic resin.
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