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| Number | Title | Issue Date |
| 6711155 | Distributed PBX, KSU and the like system utilizing internet protocol A distributed PBX, KSU and the like system has at least one time domain multiplexed (TDM) switch unit interfaced with transparent wideband channels such as Ethernet by means of at least one Public Switched Telephone Network (PSTN) interface unit and at least one ser... | 03/23/2004 |
| 4532380 | Tone signalling adapter for a telephone set A tone signalling adapter for providing standard dual tone dialing capabiy to a ring-down type military field telephone set and comprising a 16 button key set mounted on a generally rectangular body secured to a saddle member which clips onto the top por... | 07/30/1985 |
