retreating face retreating mining retreatment re-treatment cell retreatment of tailing retreat mining retrenchment retrieval retrieval time retroaction retroactive amplification retroactive circuit retroactive effect retro-fit package retrofitting retrograde vernier retrogression retrogressive erosion retrogressive motion retrogressive movement |
retreating face мин. забой, напредващ от границите на рудничното поле към шахтата Търсената дума е намерена |