https://patents.google.com/patent/CN104518564B/en
CN104518564B - Backup automatic switching apparatus with area automatic switching function, and...
The invention discloses a backup self-switching device with the function of regional self-switching, which is used in a power supply system with a dual power...
switching apparatusbackupautomaticareafunction
https://www.findhs.codes/hs-code-for-switching-apparatus-as-data-communication-equipments
HS Code for switching apparatus as data communication equipments
Harmonized System Code (HS codes) or HTS Code and Tariff Classification for switching apparatus as data communication equipments
hs codeswitching apparatusdata communicationequipments