Postal sorting line: Listen & Download Postal sorting line .mp3 Error! Change your browser, please! ⇓ Download Small centrifuge ⚠ Spinning machine ⚠ Bottling plant ⚠ Electric generator (hum) ⚠ Electric industrial motor ⚠ Vibrosieve at the factory ⚠ Forklift approaching ⚠ Signal for lunch at the factory ⚠ Milling machine ⚠ Book press ⚠ Circular knitting machine ⚠ Forklift drives by ⚠ ★★★★★