File:John Samuel Slater - 'Armillary sphere' - US patent No 482,278.png

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English: John Samuel Slater - 'Armillary sphere' - US patent No 482,278
Date Patented 6 September 1892
Source Armillary sphere. US patent No 482,278. Patented 6 September 1892.
Author John Samuel Slater

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