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发明名称
PROTECTION OF ROADBEDS FROM WATER SEEPAGE
摘要
申请公布号
US3608443(A)
申请公布日期
1971.09.28
申请号
USD3608443
申请日期
1969.05.26
申请人
PHILLIPS PETROLEUM CO.
发明人
DUANE W. GAGLE;HOMER L. DRAPER
分类号
E01C3/06;E01F5/00;(IPC1-7):E01C9/00
主分类号
E01C3/06
代理机构
代理人
主权项
地址
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