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发明名称
Расширитель для образования взрывчатой полости в шпуре
摘要
申请公布号
SU64473(A1)
申请公布日期
1944.11.30
申请号
SU19430001460
申请日期
1943.11.26
申请人
SPIVAK G.Z.
发明人
SPIVAK G.Z.
分类号
E21B7/28;E21B10/32
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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