Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4421206 | Ladder | — | 1983-12-20 |
| 4403373 | Hinge fitting for foldable ladders | — | 1983-09-13 |
| 4359138 | Supporting device for ladders | Nikolaus A. Kummerlin | 1982-11-16 |
| 4210224 | Longitudinally variable ladder | Nikolaus A. Kummerlin | 1980-07-01 |