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经营范围
发明名称
ROTARY SHAFT SEAL
摘要
申请公布号
GB8428162(D0)
申请公布日期
1984.12.12
申请号
GB19840028162
申请日期
1984.11.07
申请人
NL INDUSTRIES INC
发明人
分类号
E21B4/00;F03B13/02;F16J15/16;F16J15/18
主分类号
E21B4/00
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代理人
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