| 摘要 |
<p>A tamper-proof system for electrical apparatus or utilisers snap-engaged in a housing in a support plate for fixing to a wall, by insertion of the utilisers in the housing from the front, comprising first engagement means formed in a pair of opposite walls of the plate which define the said housing and are accessible only when the support is removed from the wall, and a pair of locking fingers having second engagement means which mate with the first, to contact the pair of fingers to the pair of walls, and thereby prevent the resilient tongues provided with snap-engageable teeth from yielding and thereby retaining the devices. <IMAGE></p> |
