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| Keywords: Patent 1,012,087.jpg en Steam shovel boom invention 1911 http //www google com/patents id ZIxtAAAAEBAJ pg PA1 dq 22CB+King 22 as_drrb_is b as_minm_is 1 as_miny_is 1904 as_maxm_is 12 as_maxy_is 1912 source gbs_selected_pages cad 1 v onepage q 22CB 20King 22 f false United States Patent Office 1911 PD-USGov U S Patent drawings Steam shovels | ||||
