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发明名称
Emergency venting manhole cover
摘要
申请公布号
US3339791(A)
申请公布日期
1967.09.05
申请号
US19650501306
申请日期
1965.10.22
申请人
DE FREES JOSEPH H
发明人
FREES JOSEPH H. DE
分类号
F16J13/02
主分类号
F16J13/02
代理机构
代理人
主权项
地址
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