JP2555073C - - Google Patents

Info

Publication number
JP2555073C
JP2555073C JP2555073C JP 2555073 C JP2555073 C JP 2555073C JP 2555073 C JP2555073 C JP 2555073C
Authority
JP
Japan
Prior art keywords
call
gain
volume
telephone
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Other languages
English (en)
Japanese (ja)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Publication date

Links

Family

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