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Combination Standard and Hydraulic Drilling-rig Patent Print - Gunmetal Patent Title: Combination Standard And Hydraulic Drilling-rig...read more
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Combination Standard and Hydraulic Drilling-rig Patent Print - Gunmetal Patent Title: Combination Standard And Hydraulic Drilling-rig Inventor Name: Wilson B. Wigle Year Issued: May 16 1911 Item Number: 12426 Reprint of original Patent Pat...