| 摘要 |
The pencil includes lead cartridge (2) mounted in outer cylinder (2); lead cylinder including spiral pass (5), supporting projection (9) of lead pipe supporting portion (7), slit (10) for keeping supported cylinderical material (11); lead pipe supporting portion (7) formed outside of locking member (6); lead pipe (8) of lead cartridge, moving in the dirction of axis and breaking in the direction of rotation; projection (16) inserted in spiral groove (15) formed in spiral pass.
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