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Well-Digging Machine.

Description: Patent for an improved oil well digging machine.
Date: December 1, 1908
Creator: Clack, Judge H.
Partner: UNT Libraries Government Documents Department

Joint-Chair.

Description: Patent for a joint chair for holding railroad rails in place.
Date: December 13, 1910
Creator: Ewen, William E.
Partner: UNT Libraries Government Documents Department
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