Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4624339 | Sound-proofing casing for a pneumatic percussive drill | Frederic E. Marcel | 1986-11-25 |
| 4591009 | Drill soundproofing device | Frederic E. Marcel | 1986-05-27 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4624339 | Sound-proofing casing for a pneumatic percussive drill | Frederic E. Marcel | 1986-11-25 |
| 4591009 | Drill soundproofing device | Frederic E. Marcel | 1986-05-27 |