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发明名称
Manhole shield
摘要
申请公布号
US3142234(A)
申请公布日期
1964.07.28
申请号
US19590861082
申请日期
1959.12.21
申请人
MALOON FRED V
发明人
MALOON FRED V.
分类号
E03F5/02
主分类号
E03F5/02
代理机构
代理人
主权项
地址
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