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发明名称
Sand bottom for pumps and bailers
摘要
申请公布号
US1785990(A)
申请公布日期
1930.12.23
申请号
US19280250850
申请日期
1928.01.31
申请人
CHESTER D. RUBEL;LESTER D. MOWREY;J. H. COGGINS
发明人
WELSH RALPH B.
分类号
E21B27/00
主分类号
E21B27/00
代理机构
代理人
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地址
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