Mbiri: Balancer ali ndi mbiri yazaka zopitilira 100.Mu 1866, German Siemens anatulukira jenereta.Zaka zinayi pambuyo pake, waku Canada, a Henry Martinson, adapanga njira yolumikizirana, ndikuyambitsa bizinesiyo.Mu 1907, Dr. Franz Lawa...
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