| 摘要 |
A drum main body comprising first, second and third drum body elements of cylindrical shape arranged in axial direction thereof. The third drum body element is interposed between the first and second drum body elements and is connected to rims of the first and second drum body elements by fastening bolts. The first, second and third drum body elements that are arranged in an axial direction thereof can be different from each other in materials and/or structure (depth).
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