| • longwall retreating method | |
| निवर्तन: fallback climb-down disposal retirement retreat | |
| विधि: act regularity regulation rite rule ceremony fate | |
दीर्घभित्ति निवर्तन विधि अंग्रेज़ी में
[ dirghabhiti nivartan vidhi ]
| • longwall retreating method | |
| निवर्तन: fallback climb-down disposal retirement retreat | |
| विधि: act regularity regulation rite rule ceremony fate | |
