PL285603A1 - Apparatus for performing a geophysical rock resistance survey and method of establishing the scale for use in recording the results of such survey
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Apparatus for performing a geophysical rock resistance survey and method of establishing the scale for use in recording the results of such survey
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PL28560390A1990-06-121990-06-12Apparatus for performing a geophysical rock resistance survey and method of establishing the scale for use in recording the results of such survey
PL285603A1
(en)