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经营范围
发明名称
Pipe tong
摘要
申请公布号
US2278439(A)
申请公布日期
1942.04.07
申请号
US19390273909
申请日期
1939.05.16
申请人
BYRON JACKSON CO.
发明人
GRAU HERBERT E.;LUNDEEN CHESTER A.
分类号
E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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