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| Earliest known, surviving heliography engraving in existence, made by Nicéphore Niépce in 1825 by the heliography process. |
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| Robert Cornelius, self-portrait, Oct. or Nov. 1839, approximate quarter plate daguerreotype which is a procedure invented in 1839 using silver on a copper plate. |
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| The Photo of the First Photographic Studio, 1893 |
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