File:Fredrik Ljungström patent diploma 57020 preheater 1920.jpg
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DescriptionFredrik Ljungström patent diploma 57020 preheater 1920.jpg |
English: Patent diploma issued by the Swedish Patent and Registration Office (PRV) in 1920 to Fredrik Ljungström for his invention 1920, the preheater for gas or liquids. |
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Source | STAL Company Finspång, industrial archive | ||||
Author | Swedish Patent and Registration Office (PRV) | ||||
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current | 16:07, 23 October 2009 | 409 × 630 (93 KB) | Lidingo (talk | contribs) | {{Information |Description={{en|1=Patent diploma issued by the Swedish Patent and Registration Office (PRV) in 1920 to Fredrik Ljungström for his invention 1920, the preheater for gas or liquids.}} |Source=STAL Company Finsp� |
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Horizontal resolution | 300 dpi |
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Software used | Adobe Photoshop 7.0 |
File change date and time | 15:18, 22 January 2004 |
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