Ma roller shutters ndi otchuka chifukwa cha kulimba kwawo, chitetezo komanso kugwiritsa ntchito mosavuta. Zitseko izi zimadalira makina a coil spring kuti azigwira ntchito bwino, kuonetsetsa kuti zikugwira ntchito bwino komanso zimatetezedwa ku kuwonongeka kosayembekezereka. Komabe, pakapita nthawi, akasupe awa amatha kutaya kapena kusweka, zomwe zimakhudza fuko lonse ...
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