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发明名称
APARELHO PARA SUPRESSAO DE PO DE PERFURACAO
摘要
申请公布号
BR7907465(A)
申请公布日期
1981.05.19
申请号
BR19790007465
申请日期
1979.11.16
申请人
GOSUDARSTVENNY PROEKTNY I NAUCHNO ISSLEDOVA TELSKY INSTI
发明人
SHKOLNIKOVA R;ZIMIN I;ANDREEV V
分类号
(IPC1-7):E21C7/00
主分类号
(IPC1-7):E21C7/00
代理机构
代理人
主权项
地址
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