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Double drilling transmission, which is acted upon with pressure means of clamping jaws clutch, for carrying out of alkaline earth -, preferably deep boreholes, in particular for movable deep drilling equipment od. The like.
Double drilling transmission, which is acted upon with pressure means of clamping jaws clutch, for carrying out of alkaline earth -, preferably deep boreholes, in particular for movable deep drilling equipment od. The like.