Method and apparatus for investigation of of a borehole intersected earth formations by determining the speed of sound

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• 2. 一种基于钻孔声波分布快速确定地层岩体RQD的方法 [P] . 中国专利： CN111622737A . 2020-09-04
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  机译： 用声波研究深孔相交地层的方法和装置

• 4. An apparatus for investigating through a borehole intersected earth formations with the use of a neutron source into the drilled hole be exported [P] . 德国专利： DE1062841B . 1959-08-06

  机译： 出口使用中子源通过钻孔相交的地层进行勘查的设备

• 5. An apparatus for investigating through a borehole intersected earth formations with a source of mono energy neutrons [P] . 德国专利： DE1052591B . 1959-03-12

  机译： 一种用于通过钻孔与单能中子源相交的地层进行调查的设备

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