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发明名称
Installation pour l'exploitation mécanique des couches inférieures des mines et spécialement des mines de houille
摘要
申请公布号
FR892446(A)
申请公布日期
1944.04.06
申请号
FRD892446
申请日期
1942.12.17
申请人
PREUSSISCHE BERGWERKS- UND HU:TTEN AKTIENGESELLSCHAFT
发明人
分类号
E21C27/18
主分类号
E21C27/18
代理机构
代理人
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