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Problem:The ordinary pencil would be throw away when it is too short to hold , which caused a waste of wood.
Solution:With the conception of environmental friendly we design a new kind of pencil——Con-pencil.Con-pencil could joint the short one to the new one by screwing . That means the full utilization of a pencil .With the product come out , the waste of timber resources will be efficiently decreased .
ChangChun University Of Technology