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Mar 24, 2009	The Horizontal Directional Drilling method with percussive impact Directional drilling operations unheard of in the past, now belong to the everyday scene on a job site. Application of HDD units make longitudinal installations up to 500 m possible. Crossings beneath rivers and other waters are frequently performed. For extreme conditions, the TT HDD rigs have a built-in percussive hammer which can be switched on additionally, when the drilling progress becomes unsatisfactory due to problematic grounds.

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