LB 25

I-LB 25 iyisixhumi esisha se-rig yokubhoboza ye-LB 20-230 esivele ibonakale. Ukubhoboza nge-Kelly, i-double rotary head kanye ne-continuous flight auger kuyizindlela ezivamile. Ukugxila kukhulu kumazinga aphezulu okunyakaza - i-rig ingathuthwa igcwele. Lokhu kuqinisekisa ukuhamba okusheshayo komshini phakathi kwezindawo ezahlukene zomsebenzi, ngaleyo ndlela kuthinta kahle ukusebenza okungabizi kwe-rig.