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Inventor
PANEK JR DONALD C
US
2 patents
Patents
2 patents
US5457690A
Oct 10, 1995
DTMF Signaling on four-wire switched 56 Kbps Lines
INTEGRATED NETWORK CORP
6 citations
69
US5748637A
May 5, 1998
DTMF signaling on four-wire switched 56 KBPS lines
INTEGRATED NETWORK CORP
1 citations
47