Factory atmosphere, drone in a mine tunnel: Listen & Download Factory atmosphere, drone in a mine tunnel .mp3 Error! Change your browser, please! ⇓ Download Signal for lunch at the factory ⚠ Box making machine ⚠ Postal sorting line ⚠ Hydraulic down machine ⚠ Small centrifuge ⚠ Steam pump ⚠ Automatic telephone switch ⚠ Stamping press ⚠ Canning machine ⚠ Laser welding ⚠ Room noise, Glass bottles on a conveyor line ⚠ Mechanical lift ⚠ ★★★★★