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 | by Bouabdellah
 
	Date: 27 - Jul - 2008Level: 
    intermediate
 Age: +12
 Description:Since man began to need to move things, he has used round rollers to make the job easier. Probably the first rollers were sticks or logs, which were a big improvement over dragging things across the ground, but still difficult work.
In 1794, Welsh ironmaster Philip Vaughan invented a device....
 
    
    
    
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