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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 249.820 Static Electricity G01.358.500.260 Electromagnetic Fields G01.358.500.505 Electromagnetic Radiation G01.358. ... 358.750 Magnetic Fields G01.358.750.500 Electromagnetic Fields G01.374 Mechanical Phenomena G01.374.089 Biomechanical ...