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MOBILE GROOVE MACHINE FOR DRILLING MICROTUNNEL, TUNNEL AND WELLS AND A DEEP DRILLING MACHINE PROVIDED WITH A RE-ENTRANT SUPERIMPOSED IMPACT TOOL
MOBILE GROOVE MACHINE FOR DRILLING MICROTUNNEL, TUNNEL AND WELLS AND A DEEP DRILLING MACHINE PROVIDED WITH A RE-ENTRANT SUPERIMPOSED IMPACT TOOL
The invention relates to a microtunnel, tunnel and well mobile groove drilling machine and deep drilling machine provided with a re-entrant superimposed impact tool
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