Umlando: I-balancer inomlando weminyaka engaphezu kwe-100.Ngo-1866, i-Siemens yaseJalimane yasungula i-generator.Ngemva kweminyaka emine, uHenry Martinson, waseCanada, wagunyaza indlela yokulinganisa, wethula imboni.Ngo-1907, uDkt. Franz Lawa...
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