| 摘要 |
The rotatable support for inclinable masts of drilling machines includes a connecting element, assembled on the back side, or anyway connected with the self-propelled carriage or with the lifting mechanism of the perforating machine, on the front vertex of which a coupling elements fit for bearing the mast, rotating by two always hinged oil-dynamic pistons, is hinged by two hinges with the same rotational axis and spaced one from the other in order to allow the passing between them of the elongating stem.
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