Japanese import beryllium bronze belt , phosphorous bronze belt , complex mosaic of precious metals with wood , of silver and tin mining temperature of overheating protection device and the double - metal ware , three metal belt 日本进口铍青铜带、磷青铜带、各种镶嵌复合贵金属带材、复银和复锡铜带温控器和过热保护器用的各种双金属，三金属带。
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