| 摘要 |
An apparatus for persons to be lowered to a ground from upper stories of buildings, in case of a fire, or the like; the device including a frame suspended outside a window, two heels of ropes supported on the frame, a seat on the end of each rope, one rope winding up automatically as the other unwinds, and a speed-damping mechanism to retard too fast descent of a lowering person.
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