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发明名称
VOICE-FREQUENCY KEY DIALLING METHOD
摘要
申请公布号
CA810259(A)
申请公布日期
1969.04.08
申请号
CAD810259
申请日期
申请人
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
发明人
OTTO BAADE;LORENZ GASSER
分类号
主分类号
代理机构
代理人
主权项
地址
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