File:Photomicrograph of annealed and quenched steel, from 1911 Britannica plates 11 and 14.jpg
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Photomicrograph_of_annealed_and_quenched_steel,_from_1911_Britannica_plates_11_and_14.jpg (284 × 274 pixels, file size: 27 KB, MIME type: image/jpeg)