Angle iron is specified at the edges as a protective device for the covering plate.
按照规定，盖板边缘加装角钢起保护作用。
It is unnecessary to fill lubricant every day, equipped with a falling pressure lose protective device for broken hydraulic tubing and a lifting arm gyro angle lock unit.
本机设有防跌落支承保险装置，油管爆裂失压保险，举升托臂回转角度锁定装置。
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