Mining companys have proven ways to locate ore at distances,but i do not beleive the same devices would work on a small treasure or handfull of coins.The pistel like locaters that we have seen pictures of in posts on this site from the 1980's,i beleive work,how good who knows.I beleive they transmit a signal and receive a different signal,but what do they transmit and what do they receive,if we new those two we could build one,we know part of the units use BFO occilater,does anybody know what it transmits and receives?
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