Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D672054 | Mobile stage | Roy M. Mertik, Donald McCallum | 2012-12-04 |
| 6393769 | Portable stage | Roy M. Mertik, Donald McCallum | 2002-05-28 |
| 5443113 | Heat exchangers | Ronald Mulholland | 1995-08-22 |