Keywords: Chemical Warfare in the Twentieth Century Q60978.jpg Chemical Warfare in the Twentieth Century<br/> The First World War American Mobile Degassing Unit No 1 with mobile shower spray in full operation at Tours American official photographer 1918-07-21 First World War Q 60978 205194056 http //media iwm org uk/iwm/mediaLib//37/media-37052/large jpg This image was created and released by the Imperial War Museum on the http //www iwm org uk/corporate/privacy-copyright/licence IWM Non Commercial Licence Photographs taken or artworks created by a member of the forces during their active service duties in the First World War became covered by Crown Copyright provisions and so faithful reproductions may be reused under that licence which is considered expired 50 years after their creation Associated places Tours Indre-et-Loire France Associated events Western Front First World War Associated themes Chemical Warfare Western Front 1914-1918 Associated keywords Chemical Warfare American First World War Official Exchange Collection photographs PD-USGov American First World War Official Exchange collection Images uploaded by Fæ Chemical warfare |