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发明名称
Door open signal system
摘要
申请公布号
US2437777(A)
申请公布日期
1948.03.16
申请号
US19450583764
申请日期
1945.03.20
申请人
KAROL ZAJC
发明人
ZAJC KAROL
分类号
H01H13/18
主分类号
H01H13/18
代理机构
代理人
主权项
地址
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