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About product and suppliers:
        Alibaba.com offers 4,879 socket 21 products. About 3% of these are electrical plugs & sockets. 

A wide variety of socket 21 options are available to you, such as residential / general-purpose, industrial, and hospital. You can also choose from wall socket, extension socket, and tabletop socket. As well as from standard grounding, non-grounding, and isolated ground. And whether socket 21 is free samples, or paid samples. 

There are 4,879 socket 21 suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of socket 21 respectively. 

Socket 21 products are most popular in Western Europe, North America, and South America. 

You can ensure product safety by selecting from certified suppliers, including 1,877 with ISO9001, 613 with Other, and 227 with ISO/TS16949 certification.
        
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