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| Number | Title | Issue Date |
| 4800833 | Tubular door lock with a bell A sort of tubular door lock whose inside knob or outside knob can be forced to rotate by each other's rotation and force a rotating unit to turn pushing and overpassing a projection of a knocking spring to get the knocking points at its both ends to knock... | 01/31/1989 |
| 4577584 | Bell lock (II) An improved knob lock commonly used, which comprises a bell inside. The main part of which is a rotator which is turned by rotating either of the knobs and has two extending-out springs to which are attached a steel ball respectively at their ends. Hindra... | 03/25/1986 |
