Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4843406 | Method and apparatus for detecting the presence or absence of a pen in pen recorder | John V. White, George K. Branner | 1989-06-27 |
| 4812858 | Indexing mechanism | — | 1989-03-14 |