Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868487 | Frequency response analyser with multiplying digital to analogue converter | — | 1989-09-19 |
| 4868494 | Methods and apparatus for frequency response analysis | Brian Sayers | 1989-09-19 |