Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8510946 | Helicopter blade mandrel with roller assembly | Richard A. Callis, Wayne Johnston, David P. Bailey | 2013-08-20 |
| 8066504 | Helicopter blade mandrel with roller assembly | Richard A. Callis, Wayne Johnston, David P. Bailey | 2011-11-29 |