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The rulers axial offers small holes that can fix tow pencil to draw a circle. The additional scale demonstrates the correspond circumference. Radeal ends with a semicircle to give a direction and to suggest the function, of turning around.
Ilka Jacobus Diplomarbeit "beziehungsweise" betreut durch Dipl. Des. Birgit Weller und Dipl. Des. Gunnar Spellmeyer