Tianjin Societas Technologiae Photoelectricae Opticae Liberae, Ltd. Inscriptio D6-A-201, Regio Orientalis, Parcum Industriale Huigu, Via Xuefu Occidentalis No. 1, Zona Industrialis Xuefu, Regio Xiqing, Tianjin, Sina. Epistula electronica admin@free-optic.com Telephonum Venditiones: (86-22) 8137 0773 WhatsApp WhatsApp:86-131 1008 9902
