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Jean-Barthélémy Camille Polonceau (29 October 1813 – 21 September 1859) was a French railway systems engineer. He was born in Chambery, France, and died in the French commune Viry-Chatillon.

In 1839 he invented the Polonceau truss, a method of roof construction considered "one of the most successful roof designs of the nineteenth century".

Polonceau's name is one of the 72 names on the Eiffel Tower.

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