Issued Patents 2016
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9449590 | Low frequency audio sound effects in model railroading | Frederick E. Severson | 2016-09-20 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9449590 | Low frequency audio sound effects in model railroading | Frederick E. Severson | 2016-09-20 |