U.S. Patent #6,525,329 describes a method and device for detecting U.S. currency that has been hidden within the walls of a building. The patent was filed on October 1, 2000 by inventor David Berman of Staten Island, NY. This invention could come in handy if you live in an old house, especially one that was lived in by paranoid octogenarians, or others who wouldn’t want to trust their cash to a bank. After some successful treasure hunting within the Bank of Drywall, this device could even pay for itself!
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