| 摘要 |
A sharp pencil eraser is provided to allow the length of an eraser to be controlled without additional tool. A sharp pencil lead case of a sharp pencil eraser comprises a nut tunnel(8) which has a screw thread in the using direction of an eraser and is formed inside the sharp pencil lead case. The sharp pencil eraser is provided with an eraser holder(10) comprising the screw threads(7, 7a) at the inner and outer sides at the one terminal part.
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