Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878188 | Selective active cancellation system for repetitive phenomena | — | 1989-10-31 |
| 4862506 | Monitoring, testing and operator controlling of active noise and vibration cancellation systems | Harris B. Landgarten | 1989-08-29 |