Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691888 | Power controlling unit for a trolley pole switch controller | Charles C. Siegling, III, Francis A. Launier | 1997-11-25 |
| 5677608 | Embedded duplex local control panel | David A. Greer | 1997-10-14 |