ULL-F-010391-0000 First World War: a German doctor with a protective equipment of resprio after the first use of poison gas warfare in the battle of Ypres Credit: Ullstein Bild / Alinari Archives WARNING: Permission must be required for non editorial use. Please contact Alinari Archives Date of photography: 04/1915 Place of photography: Europe Event: World War I, 1914-1918 Collection: Ullstein Bild / Alinari Archives Object type: digital image Photographic technique: P digital image Technical info Image sizes (pixel): 4689 X 7015 Image sizes (cm at 300 dpi): 39 X 59 Image sizes (MB): 4.73 Color space: RGB