Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4328603 | Street sweeping machine | Donald L. Dickson | 1982-05-11 |
| 4320552 | Street sweeping machine | Donald L. Dickson | 1982-03-23 |
| 4308632 | Gutter broom assembly for a street sweeping machine | Donald L. Dickson | 1982-01-05 |