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Inventor
LEHMACHER MARKUS
DE
2 patents
Patents
2 patents
US6343123B1
Jan 29, 2002
Method of establishing a toll-free communication connection, as well as a service unit, an exchange and a communications network
CIT ALCATEL
23 citations
88
US6028918A
Feb 22, 2000
Telecommunication system, and switching means, and memory means, and method
CIT ALCATEL
4 citations
58