| 摘要 |
A thumb-knob assembly for preventing a mortise lock from being opened from the outside even by a proper key. My thumb-knob assembly may be the one shipped with the mortise lock or may be bought separately and substituted for the thumb-knob assembly that was originally installed. It affords better protection than an extra bolt or a night-latch without their installation cost, is superior in appearance, and its installed cost should be less.
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