Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5701338 | Call box with keyboard communication | Thomas Leyen, Ronald Sheldrup, Warren Burks | 1997-12-23 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5701338 | Call box with keyboard communication | Thomas Leyen, Ronald Sheldrup, Warren Burks | 1997-12-23 |