Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845758 | Equalizer with adjustable band filters and a digital filter suitable for use in the equalizer | Franciscus J. Op de Beek, Johan M. Rijnsburger, Johannes W. Kemna | 1989-07-04 |