| 摘要 |
An improvement is provided for a retractable tip marking pen whereby the tip, in its retracted position, is enclosed in a chamber which prevents drying of the marking fluid. The chamber is provided by an elastomeric sealing member positioned within the outer sheath of the pen adjacent the lower extremity thereof. The sealing member automatically opens when the tip is pushed to its writing position, and closes when the tip is retracted to its stored position.
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