All

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 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.252 Electricity D004560 +
    H01.671.252.528 Electromagnetics D004575 +
      H01.671.252.528.400 Electromagnetic Fields D004574 
 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.493 Magnetics D008280 +
    H01.671.493.403 Electromagnetics D004575 +
      H01.671.493.403.400 Electromagnetic Fields D004574