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Physikalisch-Technische Bundesanstalt Report about the SOCON sonar tool BSE |
| Sonar in caverns |
 SOCON SONAR CONTROL The World-wide leading engineering company specializing in the surveillance of underground caverns and voids. |
| Blanket surveying |
 BCS Value microC (Generation 4)
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| Old mine mapping |
 In many parts of Europe underground cavities created by mining exist under surface areas that are now populated.
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