... speakers and so on and has independent carpentry workshop, amplifier production workshop, the assembly shop and also the research ... Equipment Accessories Product Line Audio: 100,000 Pieces / Year;Amplifier: 20,000 Pieces / Year Audio: 100,000 Pieces, Amplifier: 20,000 Pieces ... Model No. Quantity Number of Year(s) Used Condition Audio generator machine Tronson/TVT322 4 1.0 Acceptable Electron testing ...