File:Rotary kiln Johannsen patent US1618204.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
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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