The phrase appears to be a specific identifier for a regulatory or technical document published on November 19, 2021 .
The most direct match for this specific date and technical formatting is a issued by the Environmental Protection Agency (EPA) regarding hazardous air pollutants. Key Technical Report Details Intoxicant [Finished] - Version: 2021-11-19 Pat...
This report outlines the EPA's final determination on the health risks and technological advancements in the manufacturing of refractory products (materials used for high-temperature insulation in industrial furnaces). The phrase appears to be a specific identifier