| 摘要 |
Disclosed is a writing element for use in a ball point pen comprising a ball seat member which supports a ball on a ball seat disposed at its tip end and an outer sleeve which is fitted over the ball seat member to keep the ball on the ball seat. Said outer sleeve is slidably fitted to the ball seat member so as to be frictionally engaged with the ball seat member to be slid rearwardly by the extent to which the ball seat has been worn due to the writing pressure acting on the sleeve.
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