Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5604794 | Switch system for directing call from a calling to a receiving instrument | David A. Vogel, Danny C. Vogel | 1997-02-18 |
| 5056132 | Switch device adapted to interface between an incoming telephone line and an internal telephone system | Edward R. Coleman, Danny C. Vogel, David A. Vogel | 1991-10-08 |