File:Rotary kiln Johannsen patent US1618204.png
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Summary
| Description |
Français : Brevet de Friedrich Johannsen d'un four rotatif destiné à retirer les éléments volatils du minerai de fer ou des produits ferreux.
English: Friedrich Johannsen patent for a rotary kiln designed to remove volatile elements from iron ore, or from iron products. |
| Date | |
| Source | US Patent Office |
| Author | Friedrich Johannsen (1897-1983) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:19, 27 January 2021 | | 1,016 × 550 (164 KB) | imagescommonswiki>Borvan53 | Uploaded a work by Friedrich Johannsen (1897-1983) from [https://patents.google.com/patent/US1618204 US Patent Office] with UploadWizard |
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- File:Rotary kiln Johannsen patent US1618204.png from Wikimedia Commons
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