Inventor
LINDQUIST JAMES R
US2 patents
Patents
2 patentsUS4523307AJun 11, 1985
Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones
ASTECH INC127 citations93
US4514594AApr 30, 1985
Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability
ASTECH INC108 citations93