Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845324 | Interrupter operating mechanism | Donald R. Martin | 1989-07-04 |
| 4821143 | Switchgear enclosure with improved supporting frame and improved access door | Donald R. Martin, Hinhsomchay Phouybanhdyt | 1989-04-11 |