Iityhubhu zobhedu ziingceba ze-cylindrical ezingenanto ezenziwe ngobhedu, i-alloy yobhedu kunye ne-zinc. Ezi tyhubhu zisetyenziswa kakhulu kumashishini ahlukeneyo ngenxa yamandla azo, ukuqina, kunye nokuxhathisa umhlwa. Ukutyhubela iminyaka, iityhubhu zobhedu ziye zaba yinxalenye ebalulekileyo kwi-manu...
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