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发明名称
Restoration process
摘要
申请公布号
US3013333(A)
申请公布日期
1961.12.19
申请号
US19570677049
申请日期
1957.08.08
申请人
E. I. DU PONT DE NEMOURS AND COMPANY
发明人
BURKE WILLIAM R.
分类号
E21B43/117;F42D3/00
主分类号
E21B43/117
代理机构
代理人
主权项
地址
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