| 摘要 |
Backing under extension supports of handling machinery contains a platform, which is made from panels, in which the boards are fastened between them into the groove and additionally by metallic strips and are located in the metal frame, which covers the area along the perimeter in its upper and lower part. Upper and lower structure of frame is motionlessly connected by metallic plates between them from two opposite sides of backing, and handles for transfer of backing are fixed on two other opposite sides.
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