File:Wilhelm Klinkerfues, 023.jpg
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| Description | US-Patent 122389 A von Wilhelm Klinkerfues. Improvement in apparatus for lighting gas by electricity, patented Jan. 2, 1872. |
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| Source | https://www.google.com/patents/US122389 |
| Author | Wilhelm Klinkerfues |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:15, 8 February 2018 | | 2,015 × 2,944 (989 KB) | Gerd Leibrock (talk | contribs) | x |
| 17:48, 8 February 2018 |  | 2,053 × 2,950 (990 KB) | Gerd Leibrock (talk | contribs) | == {{int:filedesc}} == {{Information |Description = US-Patent 122389 A von Wilhelm Klinkerfues. Improvement in Apparatus for Lighting Gas by Electricity, Patented Jan. 2, 1872, 1872. |Source= https://www.google.com/patents/US122389 |Date= 1872 |Auth... |
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