Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6047594 | Digital turn plate apparatus | William P. Kroll, Karl J. F. Kroll | 2000-04-11 |
| D399144 | Digital turn plate | William P. Kroll, Karl J. F. Kroll | 1998-10-06 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6047594 | Digital turn plate apparatus | William P. Kroll, Karl J. F. Kroll | 2000-04-11 |
| D399144 | Digital turn plate | William P. Kroll, Karl J. F. Kroll | 1998-10-06 |