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INVENTOR : Journal of Science and Technology Published by Fakultas Sains dan Teknologi Universitas Nahdlatul Ulama Sunan Giri Bojonegoro, Indonesia Jl. A. Yani No. 10, Bojonegoro, East Java, Indonesia, 62115 Phone: +62 812-3526-8282 Website:http://unugiri.ac.id/ Email: email@example.com ISSN: 2620-9306 (online)