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发明名称
JUSTERBAR BOEYD SUBB.
摘要
申请公布号
NO912480(D0)
申请公布日期
1991.06.25
申请号
NO19910002480
申请日期
1991.06.25
申请人
CANADIAN FRACMASTER LTD
发明人
WAWRZYNOWSKI, MICHAEL
分类号
E21B7/06;(IPC1-7):E21B/
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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