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发明名称
Electric annunciator drop
摘要
申请公布号
US2444476(A)
申请公布日期
1948.07.06
申请号
US19460692904
申请日期
1946.08.24
申请人
FEDERAL TELEPHONE AND RADIO CORPORATION
发明人
STEARN FRANKLIN A.
分类号
H01H5/02;H01H9/16
主分类号
H01H5/02
代理机构
代理人
主权项
地址
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