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发明名称
Combination rotary table and pack-off head
摘要
申请公布号
US2199733(A)
申请公布日期
1940.05.07
申请号
US19380207176
申请日期
1938.05.11
申请人
BECKMAN FRED G
发明人
BECKMAN FRED G.
分类号
E21B3/04;E21B33/08
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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