File talk:Etienne-Louis Malus.jpg

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According to Old Antique Prints and the Smithsonian Library, this engraving is the work of Ambroise Tardieu, who died in 1841. It should therefore be in the public domain globally, and the latter source specifically declares it to be in the public domain in the USA. — 以上未签名的留言是由该用户加入的： Gavin R Putland (留言 • 贡献) 08:13, 11 May 2019 (UTC)[回复]

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