Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4272202 | Ribbon cartridge with broken unidirectional friction drive and self cleaning gears | Marvin C. Schroeder | 1981-06-09 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4272202 | Ribbon cartridge with broken unidirectional friction drive and self cleaning gears | Marvin C. Schroeder | 1981-06-09 |