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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