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经营范围
发明名称
Signaling system
摘要
申请公布号
US2364357(A)
申请公布日期
1944.12.05
申请号
US19440528633
申请日期
1944.03.29
申请人
HALSTEAD WILLIAM S
发明人
HALSTEAD WILLIAM S.
分类号
H04M11/04
主分类号
H04M11/04
代理机构
代理人
主权项
地址
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