Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4364144 | Duster head and method of making same | Richard Mullan, Earl Boring, Jerry Hjellum, Alexander Christison | 1982-12-21 |
| 4345351 | Extension handle for dust mops and the like | Earl Boring, Jerry Hjellum | 1982-08-24 |