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发明名称
DISPOSITIF DE VERROUILLAGE POUVANT ETRE DEVERROUILLE
摘要
申请公布号
FR2497917(B1)
申请公布日期
1987.04.24
申请号
FR19820000572
申请日期
1982.01.15
申请人
AVA INTERNATIONAL CORP
发明人
NEIL H. AKKERMAN
分类号
E21B17/06;E21B23/00;E21B23/02;E21B33/12;E21B43/10;F16J15/32;F16L17/035;F16L37/133;(IPC1-7):F16L37/22;E21B17/08;E21B33/038;E21B33/04;F16J15/16
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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