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发明名称
Underground sheeting methods
摘要
申请公布号
US3068656(A)
申请公布日期
1962.12.18
申请号
US19600021973
申请日期
1960.04.13
申请人
CONTACT SHEETING, INC.
发明人
BOOTH WELDON S.;COAKLEY ALFRED J.
分类号
E02D17/04;E02D29/02
主分类号
E02D17/04
代理机构
代理人
主权项
地址
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