https://patents.google.com/patent/SU461397A1/en
SU461397A1 - Acoustic logging equipment - Google Patents
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https://ivyzhang918.en.made-in-china.com/product/PdtfmiNuHjAe/China-Multi-Parameter-Logging-Probes-Borehole-Gamma-Ray-Detectors-Acoustic-Borehole-Imaging-Systems.html
Multi-Parameter Logging Probes Borehole Gamma Ray Detectors Acoustic Borehole Imaging Systems -...
Multi-Parameter Logging Probes Borehole Gamma Ray Detectors Acoustic Borehole Imaging Systems, Find Details and Price about IP68 Borehole Logging Probes...
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https://dspace.mit.edu/handle/1721.1/90480?show=full
Multipole seismoelectric logging while drilling (LWD) for acoustic velocity measurements
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