Ka 1987, tokomane ea tekheniki e nang le sehlooho se reng "litlhoko tsa khokahano ea ho kenya letsoho ho Supplement 1 to iec439" e ile ea ngoloa ke Komiti e nyane ea Tekheniki ea International Electrotechnical Commission (IEC) 17D, e ileng ea tsebisa ka molao khokahanyo ea ho kenella kahare ho ...
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