Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4339228 | Power unit for single line pneumatic tube system | Charles K. Kelley | 1982-07-13 |
| 4325660 | Single line pressure-pressure pneumatic tube system | — | 1982-04-20 |
| 4315704 | Single line pneumatic tube system | Charles K. Kelley | 1982-02-16 |