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Emery wheel initiatively dispels heat
The utility model discloses an emery wheel initiatively dispels heat, including emery wheel disk body, aluminium core and diaphragm, the emery wheel disk body has central cavity, central through
Drill stem with internal powder discharging function
The invention discloses a drill stem with an internal powder discharging function. The drill stem comprises a front segment, a rear segment and a drill bit, wherein the drill stem is hollow, a