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发明名称
Electromagnetic signaling device
摘要
申请公布号
US1966476(A)
申请公布日期
1934.07.17
申请号
US19300471911
申请日期
1930.07.31
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
ZWIETUSCH EDUARD O.
分类号
G10K1/062
主分类号
G10K1/062
代理机构
代理人
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地址
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