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Things that have to move by cart are usually very heavy. Because the support board is too low to elderly, it might cause harm to their body. This cart can work as a lifter, so that the stuffs can be lifted up higher and easier to reach. The wheels can lie down as feet of the cart and make the cart stable.
CHANG,JIA-YU LIN,LIANG-JUN ZHAN,ZI-LIN HUANG,CHANG-RUEI