tunnelling system comprised of a cutting wheel, cutting wheel shield, a crane for moving tunnel wall segments, an erector machine for erecting tunnel wall components; and tunnelling machines; namely, soft rock machines, tunnel boring machines, excavators, road headers, and earth pressure balance shields and parts and fittings therefor

'balanc':42 'bore':34 'compon':25 'compris':3 'crane':12 'cut':6,8 'earth':40 'erect':22 'erector':19 'excav':36 'fit':47 'header':38 'machin':20,28,32,35 'move':14 'name':29 'part':45 'pressur':41 'road':37 'rock':31 'segment':17 'shield':10,43 'soft':30 'system':2 'therefor':48 'tunnel':1,15,23,27,33 'wall':16,24 'wheel':7,9

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