Improvements in blades of blades to open tunnels, galleries and similar, with blades arranged on the periphery of the cross section of the front, pressable forward individually or by groups, which have at their front ends oblique edges, characterized by the different blades of the shield in each case, a chamfered front face has a cutting plate movable parallel to it, together with a device for adjusting the cutting plate and a measuring device that indicates the measurement of the radial location towards the outside of the cutting plate. (Machine-translation by Google Translate, not legally binding)
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