Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D264691 | Telecommunications test instrument | Louis H. Zumbahlen, Jr. | 1982-06-01 |
| 4327258 | Method and apparatus for rapid evaluation of parameters affecting voiceband data transmission | Louis H. Zumbahlen, Jr. | 1982-04-27 |