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发明名称
PISTON ASSEMBLY WITH PRIMARY AND CO-CENTRIC SECONDARY PORTIONS
摘要
申请公布号
US5129311(A)
申请公布日期
1992.07.14
申请号
US19900554060
申请日期
1990.07.16
申请人
NATIONAL-OILWELL (UK) LTD.
发明人
HART, R.
分类号
F15B15/14
主分类号
F15B15/14
代理机构
代理人
主权项
地址
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