L.S.C. New instrument tests concrete mix; water-cement ratio found electrically. Materiales de Construcción, [S. l.], v. 3, n. 044, p. 39–39, 1953. DOI: 10.3989/mc.1953.v03.i044.2681. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2681. Acesso em: 23 jul. 2024.