Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847908 | Loudspeaker having a two-part diaphragm for use as a car loudspeaker | Johannes W. T. Bax, Johannes J. M. Kamphues, Franciscus C. M. De Haas | 1989-07-11 |
| 4829581 | Electrodynamic transducer comprising a two-part diaphragm | Georgius B. J. Sanders | 1989-05-09 |