Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676224 | Electrical collector shoe assembly | William R. Heil, Robert Scott Beale | 1997-10-14 |
| 5605209 | Composite electrical conductor rail | William R. Heil, Robert Scott Beale | 1997-02-25 |