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إن رحلة الإستكشاف الحقيقية لا تستلزم الذهاب لأراض جديدة بل تستلزم الرؤية بعيون جديدة.The 1st metal detector was probably the simple electric conduction metal detector ca. 1830.[forty one] Electric powered conduction was also used to Track down metallic ore bodies by measuring th