أوتوماتيكي متطور لكشف الذهب الدفين والذهب الخام والعملات المعدنية القديمة في باطن الأرض The initial steel detector was very likely The straightforward electric conduction metal detector ca. 1830.[forty one] Electric conduction was also utilized to Identify steel ore bodies by measuring the conductivity among metallic rods pushed into the ground. https://cruz009x1.blogproducer.com/39389481/helping-the-others-realize-the-advantages-of-كاشف-المعادن-تحت-الأرض