Faʻamatalaga: I le 1987, o le pepa faʻapitoa e faʻaulutalaina "manaoga mo le faʻamaopoopoina o le insulation i le Supplement 1 i le iec439" na faʻatulagaina e le Sub Technical Committee o le International Electrotechnical Commission (IEC) 17D, lea na faʻalauiloaina aloaia ai le faʻamaopoopoina o le insulation i totonu o le ...
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