This is the main structure which controls the weight og the object being lifted. Two winge systems will be install ; one at the back of the beam and the other to the side. The winge sytem to the back of the beam will help the top beam to be hoisted up and down such that it reached its target object before carrying out any lifting action. The winge sytem to the side will will be use to alternate the cord lengths.
To the side are aslo metal bars. these are positioned such that they can aid in the rotation of the whole crane system and eventually move object from one position to the another.
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