Postal sorting line: Listen & Download Postal sorting line .mp3 Error! Change your browser, please! ⇓ Download Air blow, Air compressor ⚠ Power station turbine ⚠ Turn off, Air compressor turn on ⚠ Stop, Lathe turning on, work ⚠ Canning machine ⚠ Letter press ⚠ Working machine engine ⚠ Forklift raises, lowers forks ⚠ Spinning machine ⚠ Breakdown press ⚠ Forklift truck moving away ⚠ Welding transformer operation under load ⚠ ★★★★★