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发明名称
Tunnelling method and apparatus
摘要
申请公布号
US3407609(A)
申请公布日期
1968.10.29
申请号
US19670633193
申请日期
1967.04.24
申请人
PATRICIA LORNA KOSOGORIN
发明人
KOSOGORIN PATRICIA LORNA
分类号
E21D11/15;E21D19/04
主分类号
E21D11/15
代理机构
代理人
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地址
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