| 摘要 |
Disclosed is a self-raising platform assembly that is designed to be erected close to a building wall in order to be used by workmen to construct, repair or otherwise work an said wall. The platform assembly comprises at least one tower along which a platform may be moved up or down by means of a lifting mechanism incorporating at least one and preferably two caterpillar belts that are mounted on the platform so as to operatively engage a pair of corresponding racks mounted on the tower.</SDOA B>
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