REPLACEMENT DETECTING DEVICE FOR LUMP OF NOBLE METAL

摘要

PROBLEM TO BE SOLVED: To relatively easily and securely decide whether or not a lump of noble metal in a case is replaced without taking the lump of noble metal out of the case. SOLUTION: The lump 11 of noble metal is put in the case 12 made of a nonconductive material and an electronic circuit 13 is wired over both the case 12 and lump 11 of noble metal. This electronic circuit 13 is fixed to both the case 12 and lump 11 of noble metal and broken when the lump 11 of noble metal is taken out of the case 12. A detecting means set at a specific place transmits a radio wave to the case 12 from outside to detect whether or not the electronic circuit 13 is broken.