Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4850169 | Ceiling runner | George W. Burkstrand, Theodore S. Haines | 1989-07-25 |
| D301745 | Wallboard ceiling runner | George W. Burkstrand | 1989-06-20 |
| 4807719 | Scaffolding ascent apparatus | George W. Burkstrand | 1989-02-28 |