| 摘要 |
The invention relates to a device for securing the upper 1 and lower 2 cheeks of the pulley carriers belonging to the guidance system of the parallel ruler 3. Drawing instrument. Integral with these pulley carrier cheeks are a securing vice grip 11 with a tightening screw 7. On these vices is a bevelled edge allowing the parallel ruler 3 to be slid as far as the outer edge of the board 4, thereby increasing the working area. <IMAGE>
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