Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4768617 | Adjustable stairway having retractable wheel carriage | John E. Mason, Gary Lurken, Dale A. Sellner | 1988-09-06 |
| 4241777 | Portable shell | Jerry A. Wenger, David R. Boeddeker, Harvey M. Urch | 1980-12-30 |
| 4238097 | Conductor's chair | David R. Boeddeker, Logan Johnson, Jerry A. Wenger | 1980-12-09 |