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发明名称
Alarm system
摘要
申请公布号
US2298840(A)
申请公布日期
1942.10.13
申请号
US19380193873
申请日期
1938.03.04
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
PURCELL GERALD G. N.
分类号
G07C1/20
主分类号
G07C1/20
代理机构
代理人
主权项
地址
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