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Safety drawing compass or dividers for school children.
Safety drawing compass or dividers for school children.
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机译:安全绘图指南针或小学生的分隔线。
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摘要
The compass or dividers includes a leg 3a having a safety point 5 in the form of 2 shallow cone with a wide angle eg. 60 DEG - 120 DEG at the apex 5b, the base of the cone having a diameter of 3mm or more. The point is made from steel by turning or milling so that the apex is free from burning. The point 5 is part of an endpiece 4 which includes a stem 4a received in hole H at the bottom of plastics leg 3a, shoulder 4b determining the depth of insertion. IMAGE
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