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Using pencil could save paper, if people were willing to erase, or simply had an E-rubber to refresh every sheet of used paper for us. E-rubber is an electrically powered eraser which works as an printer, but the effect is just the other way around.
NingBo University of Technology
NingBo, China
NingBo University of Technology
NingBo, China
Yunxiao Zheng
Shaowen Xu