Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5327685 | Electric drill completed with a set of grinding equipments | — | 1994-07-12 |
| 5195610 | Bidirectionally foldable step ladder | — | 1993-03-23 |
| 5170862 | Locking device for bidirectionally foldable step ladders | — | 1992-12-15 |
| 5158151 | Bidirectionally foldable step ladder | — | 1992-10-27 |