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经营范围
发明名称
Safety tubing gate
摘要
申请公布号
US2047569(A)
申请公布日期
1936.07.14
申请号
US19300430512
申请日期
1930.02.24
申请人
LOOMIS WALTER A
发明人
LOOMIS WALTER A.
分类号
E21B33/00;E21B33/03
主分类号
E21B33/00
代理机构
代理人
主权项
地址
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