| 摘要 |
In an attachable device for connecting an undetermined number of switches utilizing special bolts (2,2'), bolts (2,2') were formed on one, body with male threads (4,4') at one end, a head (5,5'), and a flange (14,14') having a larger diameter than that of the male threads (4,4') at the other end Female threads (6,6') relative to male threads (4,4') were formed at heads (5,5'). A circuit projecting ring was formed at seat (15,15') of flange (14,14').
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