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发明名称
Time switch
摘要
申请公布号
US1893904(A)
申请公布日期
1933.01.10
申请号
US19300420415
申请日期
1930.01.13
申请人
JOHN S. STONE
发明人
PETRUS JOHN B.
分类号
G04C21/28
主分类号
G04C21/28
代理机构
代理人
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