Issued Patents 2003
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6578673 | Concrete elevator rail and guidance system | Frederick H. Barker, Gilbert W. Wierschke | 2003-06-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6578673 | Concrete elevator rail and guidance system | Frederick H. Barker, Gilbert W. Wierschke | 2003-06-17 |