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揚聲器用Φ40~115mm永磁鐵氧體磁體尺寸系列

Dimension series for φ40~115mm permanent ferrite magnets for loudspeakers
標準號:SJ 1512-1979
Dimension series for φ40~115mm permanent ferrite magnets for loudspeakers
標準號:SJ 1512-1979