Semiconductor Devices; Electric Solid State Devices Not Otherwise Provided For
H02M
Apparatus For Conversion Between Ac And Ac, Between Ac And Dc, Or Between Dc And Dc, And For Use With Mains Or Similar Power Supply Systems; Conversion Of Dc Or Ac Input Power Into Surge Output Power; Control Or Regulation Thereof
F24F
Air-conditioning; Air-humidification; Ventilation; Use Of Air Currents For Screening
F25B
Refrigeration Machines, Plants Or Systems; Combined Heating And Refrigeration Systems; Heat Pump Systems
