| 摘要 |
A washer includes a bore formed in an annular member, and one or more openings formed in the annular member for suitably decreasing the weight of the washer and for facilitating the contact and engagement between the washer and the other parts or elements for allowing the washer to be suitably and snugly or solidly engaged between the various parts or elements, the openings of the washer includes a shape selected from an oblong shape, a circular shape, a square shape, a pentagon shape, a hexagon shape, or a rhombus shape.
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