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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 700.250 Ear Protective Devices E07.700.380 Head Protective Devices E07.700.500 Masks E07.700.500.450 ... Eye Protective Devices J01.637.708.560.750 Head Protective Devices J01.637.708.560.782 Masks J01.637. ...