An apparatus and method for monitoring stored material is disclosed. Material to be stored and monitored is placed within the innermost container of a series of nested containers and monitoring fluids are circulated in a closed loop of fluid flow through the spaces between the nested containers. Monitoring...http://www.google.com.hk/patents/US4636475?utm_source=gb-gplus-share專利 US4636475 - Apparatus and method for monitoring stored material
