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Improvement in Rotary Engines.

Description: Patent for improvements in valves used in rotary engines.
Date: May 9, 1871
Creator: Hughes, Robert
Partner: UNT Libraries Government Documents Department

Improvement in Grinding-Mills

Description: Patent for an improvement in grinding-mills, combining the operative mechanism with spindles - in which the both the grinding stones obtain relative surface speeds only half the actual speed of the stones.
Date: May 9, 1871
Creator: Hensley, Henry
Partner: UNT Libraries Government Documents Department
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