Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4738565 | Method of replacing mains | Roy Streatfield, Roger D. England | 1988-04-19 |
| 4720211 | Apparatus for replacing mains | Roy Streatfield | 1988-01-19 |
| 4505302 | Replacement of mains | Roy Streatfield | 1985-03-19 |