Title:
ボタン電話装置及びエコー制御方法
Document Type and Number:
Japanese Patent JP5070603
Kind Code:
B2
Inventors:
Yuji Arou
Application Number:
JP2009045319A
Publication Date:
November 14, 2012
Filing Date:
February 27, 2009
Export Citation:
Assignee:
NEC Infrontia Co., Ltd.
International Classes:
H04Q3/58; H04B3/23; H04Q3/42
Domestic Patent References:
| JP3046419A | ||||
| JP9116936A |
Attorney, Agent or Firm:
Ken Ieiri