A mobile rig for angle drilling comprises a tiltable drilling mast and a drill pipe storage rack both mounted on a land vehicle, with a carriage movable lengthwise on a track extending alongside the mast. When the mast is in an oblique position for angle drilling, an articulating arm on the carriage...http://www.google.fr/patents/US5941324?utm_source=gb-gplus-shareBrevet US5941324 - Drilling apparatus
