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إن رحلة الإستكشاف الحقيقية لا تستلزم الذهاب لأراض جديدة بل تستلزم الرؤية بعيون جديدة.The main metallic detector was likely The straightforward electrical conduction metal detector ca. 1830.[41] Electric conduction was also accustomed to locate steel ore bodies by measuring the c