truck, tractor and trailer mounted subsoil boring equipment comprising motor means to rotate and impact a drill pipe string having a steerable drilling head at one end and a pipe advancing mechanism at the other, sources of drilling mud under pressure and compressed fluid and associated hoses, fittings and containers and location devices for the drilling head for the installation, removal, repair, replacement and servicing of buried utility items such as electrical cables and conductors, conduit, gas, water and other fluid-carrying pipes and ducts

'advanc':31 'associ':46 'bore':7 'buri':67 'cabl':73 'carri':83 'compress':43 'compris':9 'conductor':75 'conduit':76 'contain':50 'devic':53 'drill':17,23,38,56 'duct':86 'electr':72 'end':27 'equip':8 'fit':48 'fluid':44,82 'fluid-carri':81 'gas':77 'head':24,57 'hose':47 'impact':15 'instal':60 'item':69 'locat':52 'mean':11 'mechan':32 'motor':10 'mount':5 'mud':39 'one':26 'pipe':18,30,84 'pressur':41 'remov':61 'repair':62 'replac':63 'rotat':13 'servic':65 'sourc':36 'steerabl':22 'string':19 'subsoil':6 'tractor':2 'trailer':4 'truck':1 'util':68 'water':78

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