أي يستطيع تخطي جميع أنواع الصخورالمعدينة بتكنولوجيا المعايرة الأوتوماتيكية. The 1st metallic detector was probable The easy electric powered conduction metallic detector ca. 1830.[forty one] Electrical conduction was also used to Identify metal ore bodies by measuring the conductivity between metal rods pushed into the bottom. تميزه شاشات العرض الرقمية https://dominick479l7.pointblog.net/top-latest-five-كشف-المعادن-urban-news-75450271