Abstract: A cikin 1987, daftarin fasaha mai taken "bukatun don daidaitawar rufi a cikin kari na 1 zuwa iec439" kwamitin fasaha na Hukumar Zane-zane ta Duniya (IEC) 17D ne ya tsara shi, wanda a hukumance ya gabatar da tsarin daidaitawa a cikin ...
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