Per Curiam.
Hafco Foundry and Machine Company, Inc. ("Hafco") is the owner of United States Design Patent No. D681,684 ("the '684 patent"), issued on May 7, 2013 for a "Rock Dust Blower." This device is used to distribute rock dust in areas such as coal mines, where rock dust is applied to the mine's interior surfaces, to control the explosive hazards...
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