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Darmawi, Darmawi and Sipahutar, Riman and Nasution, Jimmy D and Taqwym, Ahsani and Nurussama, Nurussama (2016) THE EFFICIENCY DECREMENT OF THE SPIRAL PUMP REGARDING THE PIPE COIL DIAMETER. Proceeding Forum in Research, Science, and Technology (FIRST) 2016. ISSN 2461-0739