Robert Shenk, FLSmidth, inopa tarisiro yekuti 'girinhi' simende zvirimwa zvingaite sei munguva pfupi iri kutevera.Makumi gumi kubva zvino, indasitiri yesimende ichatotaridzika zvakasiyana zvakanyanya pane zvazvinoita nhasi.Sezvo chokwadi chekuchinja kwemamiriro ekunze chiri kuramba chichiuya kumba, kudzvanywa kwemagariro kune zvinorema emitters wi...
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