File:Rotary kiln Johannsen patent US1618204.png
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Summary
| DescriptionRotary kiln Johannsen patent US1618204.png |
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 | 01:49, 28 January 2021 |  | 1,016 × 550 (164 KB) | (username removed) |
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