Gishiri mara sumul nau'in bututu ne da ake amfani da shi don juya bututu.Daga cikin dukkan kayan aikin bututun da ake amfani da su a cikin tsarin bututun, adadin shine mafi girma, kusan 80%.Gabaɗaya, ana zaɓar hanyoyin ƙirƙira daban-daban don gwiwar hannu na kaurin bango daban-daban.A halin yanzu.gwiwar hannu mara sumul yana kafa p...
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