Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878638 | Combination frequency loop coupling for railway track signalling | James R. Hoelscher, Klaus H. Frielinghaus, Barry L. Smith | 1989-11-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878638 | Combination frequency loop coupling for railway track signalling | James R. Hoelscher, Klaus H. Frielinghaus, Barry L. Smith | 1989-11-07 |