254 Improved Hydraulic Jack. Improved Hay and Grain Hack. MECHANICAL JOURNAL IN THE WORLD PATENT AGENCY OFFICE. BLACKWOOD'S HYDRAULIC JACK. THOMAS'S HAY AND GRAIN RACK. scientific american, 1865-10-14
254 Improved Hydraulic Jack. Improved Hay and Grain Hack. MECHANICAL JOURNAL IN THE WORLD PATENT AGENCY OFFICE. BLACKWOOD'S HYDRAULIC JACK. THOMAS'S HAY AND GRAIN RACK. scientific american, 1865-10-14
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