File:T5- d684 - Fig. 521. — Projet de ballon à vapeur de M. Wolfert.png
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![File:T5- d684 - Fig. 521. — Projet de ballon à vapeur de M. Wolfert.png](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ae/T5-_d684_-_Fig._521._%E2%80%94_Projet_de_ballon_%C3%A0_vapeur_de_M._Wolfert.png/694px-T5-_d684_-_Fig._521._%E2%80%94_Projet_de_ballon_%C3%A0_vapeur_de_M._Wolfert.png?20150331211535)
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