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发明名称
Door control
摘要
申请公布号
US1978126(A)
申请公布日期
1934.10.23
申请号
US19300479598
申请日期
1930.09.04
申请人
DOOR CONTROL COMPANY
发明人
BLODGETT HERBERT CADY
分类号
B66B13/08
主分类号
B66B13/08
代理机构
代理人
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