Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4185173 | Key telephone call signalling circuit | Stephen E. Kerman, Fumikazu Hamatani, Yuji Tanaka | 1980-01-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4185173 | Key telephone call signalling circuit | Stephen E. Kerman, Fumikazu Hamatani, Yuji Tanaka | 1980-01-22 |