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发明名称
Self-balancing barrier gate
摘要
申请公布号
US2826840(A)
申请公布日期
1958.03.18
申请号
US19550546061
申请日期
1955.11.10
申请人
COOPER
发明人
COOPER BENJAMIN;CHARET MURRAY J.
分类号
E01F13/06
主分类号
E01F13/06
代理机构
代理人
主权项
地址
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