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Process of Hardening Bitminuous Substances.

Description: Patent for "a process for hardening or partly solidifying to any required degree substances such as liquid or viscid bitumens, tars, or asphaltums, either natural or artificial" (lines 8-12). It hardens bitumens without evaporating oils and leaves them solid when cooled.
Date: August 11, 1896
Creator: Dumble, Edwin Theodore
Partner: UNT Libraries Government Documents Department
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