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发明名称
Adjustable manhole frame
摘要
申请公布号
US3392640(A)
申请公布日期
1968.07.16
申请号
US19660544561
申请日期
1966.04.22
申请人
GEORGE DAVID ZEILE JR.
发明人
JR. GEORGE DAVID ZEILE,
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
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