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safety device for preventing strangers the removal of screw caps to close the vent places loading of
safety device for preventing strangers the removal of screw caps to close the vent places loading of
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机译：安全装置，用于防止陌生人卸下螺帽以关闭通风口
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摘要
the element 4, obtained from a tubular shaped and severed inferiormente to achieve a bend when forking the collar 3 located below the vent 2 closed by a screw cap 1, givesin the vicinity of the front edge of which is accessed in the loop above.two holes drilled in the vertical walls for receiving the horizontal pivot 5 intended to interfere with the shape of the stopper 1 which are bound by their head 6 and the lock 8 having therchetto this stuffed in a hole 7 drilled transversely in the end to press the pin 5.
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