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发明名称
Способ закрепления газоотводящих выработок при подземной газификации углей
摘要
申请公布号
SU55584(A1)
申请公布日期
1938.11.30
申请号
SU19380019698
申请日期
1938.11.02
申请人
ZEMELMAN B.YA.
发明人
ZEMELMAN B.YA.
分类号
E21B43/295
主分类号
E21B43/295
代理机构
代理人
主权项
地址
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