Issued Patents 2005
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6955594 | Mine door system including an air pressure relief door | John M. Kennedy | 2005-10-18 |
| 6938372 | Pneumatically-powered mine door installation with hydraulic checking system | John M. Kennedy | 2005-09-06 |
| 6846132 | Mine stopping and braces therefor | John M. Kennedy | 2005-01-25 |