| 摘要 |
An upright piano includes a fall-board hinged to a upper sill and connected through a pair of flexible coupling to side arms, and each of the flexible couplings has a rotary damper embedded in the side arm and an Oldham's coupling connected between the fall-board and the rotary damper so that the Oldham's couplings take up misalignment between the rotational axis of the fall-board and the rotational axes of the rotary dampers.
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