Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5051548 | Dual input-dual output electric switch | Joseph W. T. Underwood, IV | 1991-09-24 |
| 4959554 | Dual input-dual output electric switch | Joseph W. T. Underwood, IV | 1990-09-25 |