Postal sorting line: Listen & Download Postal sorting line .mp3 Error! Change your browser, please! ⇓ Download Air compressor, air blow ⚠ Power station turbine ⚠ Steam pump ⚠ Factory Atmosphere ⚠ Robotic assembly line ⚠ Stop, Lathe turning on, work ⚠ Postal sorting line ⚠ Start, Compressor, shutdown, run ⚠ Newspaper press ⚠ General noise, Factory work ⚠ Gas welding ⚠ Laser welding ⚠ ★★★★★