Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5139105 | Four wheel steering vehicle with valve position retaining means | Roger A. Frost, Simon Langford | 1992-08-18 |
| 4917204 | Materials handling vehicle | Roger A. Frost, Paul F. Herbert | 1990-04-17 |