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发明名称
DOOR CONTROLLING VALVE DEVICE
摘要
申请公布号
CA314808(A)
申请公布日期
1931.09.01
申请号
CAD314808
申请日期
申请人
THE CANADIAN WESTINGHOUSE COMPANY
发明人
UNCAS A. WHITAKER
分类号
主分类号
代理机构
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