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Application for penetration of gashole, water-discharging hole,and grout holeunder coalmine.
Size: Φ48-Φ270mm
Concavemodel
Pillarmodel
Blade model
Expansion model

Application for penetration of gashole, water-discharging hole,and grout holeunder coalmine.
Size: Φ48-Φ270mm
Concavemodel
Pillarmodel
Blade model
Expansion model

