Postal sorting line: Listen & Download Postal sorting line .mp3 Error! Change your browser, please! ⇓ Download Box making machine ⚠ Forklift in motion ⚠ Spectrograph ⚠ Grind metal on a grinding machine in a ⚠ Canning machine ⚠ Room noise, Glass bottles on a conveyor line ⚠ Hydraulic pump ⚠ Stamping press ⚠ Power station generator ⚠ Automatic telephone switch ⚠ Factory Atmosphere ⚠ Robotic assembly line ⚠ ★★★★★