Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4890331 | Specialized amplifier systems for musical instruments | Jack C. Sondermeyer | 1989-12-26 |
| 4811401 | Superdistorted amplifier circuitry with normal gain | Jack C. Sondermeyer | 1989-03-07 |