Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D334333 | Ground support stake for irrigation tubing | Hans D. Christen | 1993-03-30 |
| 5158231 | Mini-sprinkler stake assembly and mini-sprinkler unit and deflector therefore | Hans D. Christen | 1992-10-27 |