June 23, 2020

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Medical surveillance must be made available to employees exposed to silica at or above the PEL for 30 or more days per year, effective June 23,2018; and to employees exposed to silica at or above the action level for 30 or more days per year, effective June 23, 2020.
The three granted United States Patents are entitled to a term expiring on June 23, 2020.