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发明名称
Bearing seal
摘要
申请公布号
US3381968(A)
申请公布日期
1968.05.07
申请号
US19650480439
申请日期
1965.08.17
申请人
SMITH INDUSTRIES INTERNATIONAL, INC.
发明人
NEILSON WILLIAM J.
分类号
E21B10/22;E21B10/25;F16F1/32;F16J15/34
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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