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US07057974B2 Device for sensing seismic and acoustic vibrations 失效
用于感应地震和声振动的装置

Device for sensing seismic and acoustic vibrations
Abstract:
A device for sensing seismic and/or acoustic vibrations, has a body of a particulate material composed of a plurality of individual particles, and a system for determining changes in electrical conductivity of the particulate material caused by seismic and acoustic vibrations.
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