发明名称 |
Method of and apparatus for the investigation of inaccessible subterranean spaces such as boreholes |
摘要 |
A method of and an apparatus for investigating subterranean boreholes especially in bituminous coal mining. Optical fiber cables carry light for illuminating the hole into the latter and an image of the wall of the borehole from the latter to an evaluating means external of the borehole.
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申请公布号 |
US4657387(A) |
申请公布日期 |
1987.04.14 |
申请号 |
US19850742281 |
申请日期 |
1985.06.07 |
申请人 |
BERGWERKSVERBAND GMBH |
发明人 |
HEISING, FERDINAND;KNICKMEYER, WILHELM |
分类号 |
E21B47/00;E21B47/12;G02B23/24;(IPC1-7):G02B23/26 |
主分类号 |
E21B47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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