| 摘要 |
FIELD: drawing and graphical works. SUBSTANCE: drawing instrument has L-square with projections on its ends. Working face of wing is positioned between projections for altering angle of inclination relative to L-square. Guide thread is running in parallel with wing working face. Ends of guide thread are fastened on branches of flexible member. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 5 dwgu
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