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经营范围
发明名称
Joint ring
摘要
申请公布号
GB538517(A)
申请公布日期
1941.08.07
申请号
GB19400001724
申请日期
1940.01.29
申请人
HAROLD O'HARA
发明人
分类号
F16L23/20
主分类号
F16L23/20
代理机构
代理人
主权项
地址
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