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Isticmaalka Kala Duwan ee Duulimaadka Duulimaadka: Duulimaadyada Isku-xidhka Qaybaha Injineerinka Kala Duwan, sidoo kalena loo yaqaano isboolayaasha ama augers, ayaa ah qaybo lama huraan u ah warshado kala duwan, una adeegaya ujeedooyin badan. Naqshaddooda, oo sida caadiga ah ka kooban daab fur-fure ah, ayaa u oggolaanaya ...Sii akhri