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发明名称
Tunneling machine guidance by impingement of laser beam on pair of machine carried targets
摘要
申请公布号
US3321248(A)
申请公布日期
1967.05.23
申请号
US19650438280
申请日期
1965.03.09
申请人
HUGHES TOOL COMPANY
发明人
WILLIAMSON THOMAS N.;MULLINS JOHN M.;SHOLTESS CALVIN D.
分类号
E21D9/10;G01C7/06
主分类号
E21D9/10
代理机构
代理人
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地址
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