Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4329089 | Method and apparatus for retaining earthen formations through means of wire structures | William K. Hilfiker, Harold O. Hilfiker | 1982-05-11 |
| 4324508 | Retaining and reinforcement system method and apparatus for earthen formations | William K. Hilfiker, Harold O. Hilfiker | 1982-04-13 |