Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876686 | Fault detection signal transmission system | Seiji Fukuda | 1989-10-24 |
| 4837763 | Multiplexer for multiplexing insertion codes and a digital data signal train | — | 1989-06-06 |