Australian soldiers, wearing gas masks, in battle near the western front at Ypres (Belgium) during World War I. The first use of chemical warfare was on April 22 1915, when Germany released chlorine gas from cylinders at Ypres. The masks were simple respirators with a charcoal absorbent.

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TOP22130420

Source:

達志影像

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RM

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須由TPG 完整授權

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