Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6617967 | Piezoelectric siren driver circuit | Christopher M. Baldwin, Daniel W. O'Brien | 2003-09-09 |
| 6512450 | Extra loud low frequency acoustical alarm assembly | Christopher M. Baldwin | 2003-01-28 |