Spectrograph: Listen & Download Spectrograph .mp3 Error! Change your browser, please! ⇓ Download Fluid drilling, Brewing unit ⚠ Electric generator (hum) ⚠ Canning machine ⚠ Electric welding ⚠ Print imprinted in cardboard, Notches ⚠ Drone in a mine tunnel, Factory atmosphere ⚠ Oil pump ⚠ Crusher ⚠ Milling machine ⚠ Lowers forks, Forklift raises ⚠ Laser welding ⚠ Standby, on, off, Forklift ⚠ ★★★★★