Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6456193 | Controlling method and apparatus of constant-frequency sound-production of electrical horn | — | 2002-09-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6456193 | Controlling method and apparatus of constant-frequency sound-production of electrical horn | — | 2002-09-24 |