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API 609 Butterfly bawul
Bawul ɗin malam buɗe ido, wanda akafi sani da flap valve, nau'in bawul ne mai daidaitawa wanda ake amfani da shi sosai a masana'antu daban-daban don sarrafa kwararar ruwa. Ya ƙunshi abubuwa masu mahimmanci da yawa, waɗanda suka haɗa da jikin bawul, tushen bawul, farantin malam buɗe ido, da zoben rufewa. Waɗannan abubuwan haɗin gwiwa suna aiki tare don tabbatar da ingantaccen aiki da daidaitaccen aiki na bawul.
Dakin 703 Ginin B, Cibiyar Greenland, yankin bunkasa fasahar Hi-tech Xi'an, China
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