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发明名称
Bohrstrang-Klappenventil
摘要
申请公布号
DE1099483(B)
申请公布日期
1961.02.16
申请号
DE1959B053445
申请日期
1959.06.03
申请人
BAKER OIL TOOLS, INC.
发明人
KEITHAN JULIAN DMITRI
分类号
E21B21/10;E21B34/00
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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