From 1870 there were various attempts to build a machine that could detect metal or ore rich rocks as this would be a great mining tool. All these attempts ended up with a clumsy power hungry device that was extremely unreliable and practically useless. No major breakthroughs were made until in 1931 Gerhard Fisher a scientist working in Los Angeles on aircraft directional equipment made an observation that prompted him to make metal detectors. He noticed that interference between a radio
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