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经营范围
发明名称
MANHOLE EXTENSION
摘要
申请公布号
US3611889(A)
申请公布日期
1971.10.12
申请号
USD3611889
申请日期
1970.06.19
申请人
INTERNATIONAL MFG. CO.
发明人
LOUIS E. LEVINSON
分类号
E02D29/14;(IPC1-7):E02D29/14
主分类号
E02D29/14
代理机构
代理人
主权项
地址
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