Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4640382 | Acoustic frictional resistance construction and method of producing an acoustic frictional resistance using a laser | Hans Hartmann | 1987-02-03 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4640382 | Acoustic frictional resistance construction and method of producing an acoustic frictional resistance using a laser | Hans Hartmann | 1987-02-03 |