Perforación de rocas. Equipos para perforación por percusión con rosca soga de 22 mm a 32 mm.
ROCK DRILLING. EXTENSION DRILL-STEEL EQUIPMENT FOR PERCUSSIVE LONG. HOLE DRILLING. ROPE-THREADED EQUIPMENTS 22 TO 32 MM.
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73.100.30 / Equipment for drilling and mine excavation
CTN 22/SC 1 - Mineral raw materials
ISO 1719:1974 (Identical)
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