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For tunnelling pre-support, a hollow bar system (in the foreground) has been used amongst others. For tunnelling pre-support, a hollow bar system (in the foreground) has been used amongst others.

For tunnelling pre-support, a hollow bar system (in the foreground) has been used amongst others.

For tunnelling pre-support, a hollow bar system (in the foreground) has been used amongst others.

Media-ID: 256849
Medium provided by: DYWIDAG-Systems International, image used with kind permission.
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Last updated on: 07/06/2016

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