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发明名称
VEILIGHEIDSKLEP.
摘要
申请公布号
NL8801743(A)
申请公布日期
1989.02.01
申请号
NL19880001743
申请日期
1988.07.08
申请人
OTIS ENGINEERING CORPORATION TE CARROLLTON, TEXAS, VER. ST. V. AM.
发明人
分类号
E21B34/00;E21B34/08;F16K17/04
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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