{HEAD ~ The channel clamps} of the two support frames can be connected to {TAIL ~ two lower transverse rods} of an existing wheel chair and the joining tubes at two sides of the battery unit is connected to the joining pipe so that the battery unit can be fixed beneath a seat of the wheel chair 
{ HEAD ~ The channel clamps } of the two support frames can be connected to { TAIL ~ two lower transverse rods } of an existing wheel chair and the joining tubes at two sides of the battery unit is connected to the joining pipe so that the battery unit can be fixed beneath a seat of the wheel chair
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