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发明名称
Electrodynamic signal device
摘要
申请公布号
US1783569(A)
申请公布日期
1930.12.02
申请号
US19280291895
申请日期
1928.07.11
申请人
WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY
发明人
HANNA CLINTON R.
分类号
H04R9/08
主分类号
H04R9/08
代理机构
代理人
主权项
地址
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