| 摘要 |
PROBLEM TO BE SOLVED: To provide a plug enabling two or mare persons to simultaneously and readily enjoy music or the like by using a jack of acoustic equipment. SOLUTION: A jack 2 is provided on the upper face of an outer frame 1 of the plug. Figure shows a state in which the other plug 3 is plugged into the jack 2. Metallic pieces d7, e8, f9 respectively in contact with electrodes a4, b5, c6 are made respectively to make contact with electrodes g10, h11, i12 of the other plug 3. Furthermore, lead wires j13, k14, l15 connected respectively to the electrodes a4, b5, c6 reach an earphone or the like as a bundle 16.
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