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Bulletproof glass tests. US Army soldier using a .44 Colt handgun to test bulletproof glass being used in new armoured US Mail postal trucks. Bulletproof glass (also known as laminated glass) was invented by French chemist Edouard Benedictus in 1903. The lamination reinforces the glass and prevents it shattering. Such glass was widely used during World War I. This photograph, dating from 1 December 1921, is from the National Photo Company Collection, consisting mostly of photographs taken in Washington DC, USA.
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