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canvas prints 1900s canvas prints historical canvas prints intellectual property canvas prints label canvas prints labels canvas prints legal document canvas prints no-one canvas prints nobody canvas prints patented canvas prints protected canvas prints text canvas prints german canvas prints european canvas prints us patent office canvas prints united states patent office canvas prints

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Enigma encryption machine patent, 1928. Printed patent drawings of the mechanical cypher machine invented by German electrical engineer Arthur Scherbius (1878-1929). This encoding machine was used by the forces of Nazi Germany during the Second World War. It was a very strong encryption method, but was famously broken by Allied cryptanalysts to help them intercept and decode German wartime messages. This is patent number 1,657,411 from the US Patent Office, dated 24 January 1928.

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