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发明名称
BEARING SEAL
摘要
申请公布号
US3489421(A)
申请公布日期
1970.01.13
申请号
USD3489421
申请日期
1967.03.23
申请人
SMITH IND. INTERN. INC.
发明人
WILLIAM J. NEILSON
分类号
E21B10/22;E21B10/25;F16J15/34;(IPC1-7):F16J15/34;F16C19/49
主分类号
E21B10/22
代理机构
代理人
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地址
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