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经营范围
发明名称
Orifice construction
摘要
申请公布号
US2687147(A)
申请公布日期
1954.08.24
申请号
US19490084044
申请日期
1949.03.29
申请人
UNITED STATES QUARRY TILE COMPANY
发明人
FEICHTER HAROLD R.
分类号
D01D4/02;E21B47/10;G01F1/42
主分类号
D01D4/02
代理机构
代理人
主权项
地址
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