File:Rotary Kiln Johannsen Patent US1618204.png
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current | 20:19, 27 January 2021 | 1,016 × 550 (164 KB) | 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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