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经营范围
发明名称
Improvements relating to tunnelling and like subterranean operations
摘要
申请公布号
GB596408(A)
申请公布日期
1948.01.02
申请号
GB19450013153
申请日期
1946.06.25
申请人
ZAKO SYTSE BEIJL
发明人
分类号
E21C37/04;E21D9/00;E21D11/00;E21D20/02;E21D21/00
主分类号
E21C37/04
代理机构
代理人
主权项
地址
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