Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871327 | Combined electrical grounding and mechanical locking means for ceiling mounted device | Paul Anthony Ridgway | 1989-10-03 |
| 4810207 | Combined electrical and mechanical coupling for ceiling mounted device | — | 1989-03-07 |