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• standard polarity + standard polarity:  mechanically and electromagnetically 
• standard polarity + reverse polarity:  either mechanically or electromagnetically 
• reverse polarity + standard polarity:  either electromagnetically or mechanically 
• reverse polarity + reverse polarity:  mechanically and electromagnetically 

wall power plugs and sockets worldwide

• IEC.ch > World plugs
• Power plugs and sockets of the world
•  WorldStandards.eu
  • Country-by-country list of plugs, sockets and voltages
  • Plug & socket types around the world