vacuum tube we have 15years experience to produce vacuum tube manufacturer for more than 14years CE,CCC,ISO certificate. vacuum tube 2,graceful appearance long service life and non pollution3,the evacuated tube with superconductive heat pipe is the most advanced product inthe world4,Dimension:dia,28*1200mm,dia,28*1500mm,dia,47*1500mm,dia,47*1500mmdia,58*1800mm,70*2000mm5,High resistance to the ...