Category:PD-US-patent
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To place an image in this category, add the tag {{PD-US-patent}} to the bottom of the image's description page. If you are not sure which category an image belongs to, consult the image copyright tag page. If this category is very large, please consider adding a table of contents ({{CategoryTOC}}) or place your image in a new or existing subcategory. |
Media in category "PD-US-patent"
The following 121 files are in this category, out of 121 total.
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.png/120px-PhotoelectricEffect(Tesla).png) |
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