File:Ljungström Regenerative Heat Transmission Apparatus.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	09:20, 2 November 2009		2,793 × 2,395 (558 KB)	commons>Lidingo	{{Information \|Description={{en\|1=Fredrik Ljungströms patent drawings for the "Regenerative Heat Transmission Apparatus". Application filed at USPTO november 27, 1925. Patent granted Februari 11, 1930. }} \|Source=USPTO Patent no. 1746598,

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