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When a propelling pencil is jammed by a lead, people need to use sharp objects or other leads to
unobstructed the tube. This method is a bit cumbersome and dangerous for children.If the end
width of the lead can be designed narrower than the width of the mechanical pencil’s tube,
the remaining lead will come off the tube automatically. At the same time, this design can increase
the security of using the mechanical pencil.
HONG-PO O YANG YUN XUAN HUANG