A Feasibility Study of Mobile Phone Casings Remanufacturing Shu–San Gan, Juliana Anggono, Didik Wahjudi, Yopi Tanoto, Randy and Novana Hutasoit E3S Web Conf., 130 (2019) 01026 Published online: 15 November 2019 DOI: 10.1051/e3sconf/201913001026