Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5193108 | Portable telecommunications test instrument with inductive probe circuit | — | 1993-03-09 |
| D332575 | Electronic test set for telecommunications, alarm system, and circuit testing | John M. Redfield, David M. Rollins, Wayne R. Fukahara, Denis M. Stack | 1993-01-19 |
| 5170429 | Portable telecommunications test instrument with a talk battery circuit | David M. Rollins, William P. Pierson | 1992-12-08 |
| 5157708 | Portable telecommunications test instrument with line condition monitoring | John Garthwaite, David M. Rollins | 1992-10-20 |