File:Ljungström Regenerative Heat Transmission Apparatus.jpg
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DescriptionLjungström Regenerative Heat Transmission Apparatus.jpg |
English: Fredrik Ljungströms patent drawings for the "Regenerative Heat Transmission Apparatus". Application filed at USPTO november 27, 1925. Patent granted Februari 11, 1930. |
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Date | ||||||
Source | USPTO Patent no. 1746598, issued 1930 | |||||
Author | Fredrik Ljungström (1925) | |||||
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current | 09:20, 2 November 2009 | 2,793 × 2,395 (558 KB) | Lidingo (talk | contribs) | {{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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Horizontal resolution | 225 dpi |
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Software used | Adobe Photoshop CS Windows |
File change date and time | 08:33, 2 November 2009 |
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