| 摘要 |
A pop up writing implement that includes a pump handle, an outer sleeve, an inner pen casing, a spring, a pen cartridge and a connector, which in one embodiment is U-shaped. The pen is expandable and contractible, making it small enough to easily carry in any typical pocket. The design of the pen protects against inadvertent markings, making it unnecessary for it to have a detached pen cap. The pen of the present invention also incorporates no screws, making it immune to screw loosening problems.
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