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经营范围
发明名称
Improvements in or relating to constructions incorporating a scraper ring
摘要
申请公布号
GB522024(A)
申请公布日期
1940.06.06
申请号
GB19380035111
申请日期
1938.12.02
申请人
D. NAPIER & SON LIMITED;HENRY CHRISTOPHER TRYON;LESLIE FRANK HALL
发明人
分类号
F16J9/20
主分类号
F16J9/20
代理机构
代理人
主权项
地址
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