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发明名称
ELECTRICALLY OPERATED SIGNAL RECORDING DEVICE FOR PROTECTIVE SYSTEMS
摘要
申请公布号
CA889983(A)
申请公布日期
1972.01.04
申请号
CAD889983
申请日期
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
FREDERICK G. HILL
分类号
主分类号
代理机构
代理人
主权项
地址
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