Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D266492 | Combined whistle and cricket noise maker for use as a divers signal above and below the water surface | Karl E. Oppermann, Sr. | 1982-10-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D266492 | Combined whistle and cricket noise maker for use as a divers signal above and below the water surface | Karl E. Oppermann, Sr. | 1982-10-12 |