Bell Mouth
แปลว่า(english) The flaring or tapering of a machined hole, usually made at the entrance end because of misalignment or spring of the cutting tool.
หรือคุณกำลังค้นหา Taper, เทเปอร์(taper), taper tap, taper turning, morse taper, Back Draft, taper reamer, taper jet needle, taper pin