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Many times , you maybe forgot to put the tap back to the pen or pull the head back , which caused to broken the refill or dirty your pocket .
The "convenient pen" , whose head would appear only the button is pressed and , pull back automatically when your hand go away from it , which is avoided breaking or smudging .
Meanwhile, it can simplify the spelling time and become the initial way to spellspecify the pen , and write .
Hebei Polytechnic University
Tangshan, China
Xiao Zhang
Hebei Polytechnic University
Tangshan, China