Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4275762 | Control damper | — | 1981-06-30 |
| 4256143 | Shut-off damper | Robert J. Magill | 1981-03-17 |
| 4244397 | Shut-off damper | Robert J. Magill | 1981-01-13 |
| 4184288 | Smoke and fire shield damper | Robert J. Magill | 1980-01-22 |