Spectrograph: Listen & Download Spectrograph .mp3 Error! Change your browser, please! ⇓ Download Rattling, The atmosphere of the factory ⚠ Forklift in motion ⚠ Book press ⚠ Lathe turning on, work, stop ⚠ Steam pump ⚠ Air compressor, air blow ⚠ Crusher ⚠ Heidelberian sorting printer ⚠ Hydraulic pump ⚠ Machine engine gaining momentum ⚠ Welding transformer, working,, turning on ⚠ Laser welding ⚠ ★★★★★