Category:1897 patents
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This category has the following 2 subcategories, out of 2 total.
Media in category "1897 patents"
The following 2 files are in this category, out of 2 total.
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US591909A Argall rotary furnace longitudinal view patent.png 4,232 × 1,648; 1.71 MB
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US591909A Argall rotary furnace transversal view patent.png 2,202 × 1,302; 245 KB