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1.Single-Row slewing ring, featured in quadruple-loading-points, an advanced structre in the world, is suitable to be assemblied to the mechanical part of varilvs cranes, excavators, piledrivers, scalling-ladder of fire trucks and under groud engines.
单排球式回转支承，采用国际先进的四点接触球式结构，与各类起重机、挖掘机、打桩机、消防云梯车、地铁机车等机械设备配套。收藏指正
2.mechanically extendible ladder; used on a fire truck.
机械扩展的梯楼；用于救火车。收藏指正
3.The extreme foreshortening of his 1925 “Fire Escape”, for example, shot from below, shows a fellow climbing on a ladder.
例如，1925“烈火逃往”，极短的前景，从下往上照去，显示一个正在爬梯子的人。收藏指正
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