| 摘要 |
A device for attaching to a door knob which comprises a metal strip which has an arced width which clamps on to two peripheries of the door knob and which arced surface is also curved to encircle and contact 90% of the door knob diameter and which curved section has two free ends which are pulled into a tubular section by means of a hook bolt and end nut, the whole being assembled on to the door knob without the use of any tools or other attaching means and which complete device can be readily attached and removed for further installation on other door knobs as required.
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