| 摘要 |
FIELD: sanitary and hygienic articles. SUBSTANCE: toothbrush has handle and working block with rolls carrying bristle bunches extending in helical path. Bristle bundles are positioned in roll coil at frequency directly depending on roll rotational speed in working block. Bristle bundles are extending in continuous or intermittent path with minimum space between path portions. Coils on rolls are arranged with similar space. EFFECT: increased efficiency and improved quality of tooth cleaning.
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