| 摘要 |
The invention relates to a plug of the kind comprising a first element having at least one pin, and a second element having at least one socket designed to take the pin. The improvement is that the pin is cylindrical in shape and has an enlarged end, ogival in shape, and the socket has a square-section hole, the diameter of the circle inscribed in the hole being substantially equal to the maximum diameter of the swollen end of the pin.
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