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File:US1069085A Huntington-Heberlein roasting pot patent.png

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Français : Illustration du brevet de Thomas Huntington and Ferdinand Heberlein, améliorant leur pot de grillage du minerai, par une inversion du sens de circulation de l'air de combustion. Brevet US 1069085 A "Procédé pour récupérer le zinc et d'autres métaux volatils"
English: Image of the patent from Thomas Huntington and Ferdinand Heberlein, improving their ore roasting pot by an inversion of the combustion air. Patent US 1069085 A: "Process of recovering zinc and other volatile metals"
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Source Patent US 1069085A
Author Thomas Huntington, Ferdinand Heberlein

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:US1069085A_Huntington-Heberlein_roasting_pot_patent.png

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