This newly developed metal detector can determine the size, shape and depth of a buried metallic object. ... Previously, the National Army Guard used regular metal detectors to survey yards, which lead to tens of thousands of hits for buried metallic objects across those 84 initially surveyed homes.
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.westword.com/news/national-guard-searching-lakewood-for-unexploded-artillery-shells-from-wwii-10035741&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHrSU6wu0GMrRhvhhvqiqs-XbF2Sg
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