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发明名称
Intercom systems
摘要
申请公布号
GB2058518(A)
申请公布日期
1981.04.08
申请号
GB19800017696
申请日期
1980.05.30
申请人
TONE COMMANDER SYSTEMS INC
发明人
分类号
H04M9/00;(IPC1-7):H04M9/02
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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