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经营范围
发明名称
Combination ball valve and check valve
摘要
申请公布号
USD321928(S1)
申请公布日期
1991.11.26
申请号
US07/318191
申请日期
1989.02.28
申请人
发明人
分类号
主分类号
代理机构
代理人
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