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CPC
H04Q2213/293
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Parent Industries
H
ELECTRICITY
H04
Electric communication
H04Q
SELECTING
H04Q2213/00
Indexing scheme relating to selecting arrangements in general and for multiplex systems
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H04Q2213/293
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Patents Grants
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Information
Patent Grant
ISDN communication control unit and control method
Patent number
5,267,245
Issue date
Nov 30, 1993
Hitachi, Ltd.
Kazuhiko Maruyama
B82 - NANO-TECHNOLOGY
Patents Applications
last 30 patents