Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D661215 | Three port whistle | David Ronald Foxcroft, Graham Hills, Stephen E. Orzel, Kirk Mosna | 2012-06-05 |
| D462917 | Whistle mouthpiece | Graham Hills, Kirk Mosna, Steve Orzel | 2002-09-17 |
| 4821670 | Whistle | Charles G. Shephard | 1989-04-18 |