Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5638937 | Handrail drive system conversion | Lawrence V. Birney, Thomas Keller, William I. Thompson, Richard Alistair Balfour Stewart | 1997-06-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5638937 | Handrail drive system conversion | Lawrence V. Birney, Thomas Keller, William I. Thompson, Richard Alistair Balfour Stewart | 1997-06-17 |