... J55.N80-1. before manufacture ,the advanced spectrometer is applied for conducting material analysis ,in the course of calcinations ,the ... steps of tempering, thread processing, detecting surface, pressure testing and auto spray painting are completely in accordance with quality control ... 3/8’’2 7/8’’3 1/2’’2 3/8’’2 7/8’’3 1/2’’Antiseptic tubing,Reverse thread tubing,Various pupjoint and Small drill ...