Injin walda na butt kayan aiki ne masu mahimmanci a cikin masana'antar walda, suna taka muhimmiyar rawa wajen haɗa nau'ikan ƙarfe guda biyu tare da babban matakin ƙarfi da daidaito. Wannan labarin yana ba da cikakkiyar ma'anar injunan walda ta butt, yana nuna ayyukansu, abubuwan da suka shafi, ...
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