ResearchGate
Family 9: Rotational Elements. Rolls (9.1 - 9.10) may be performed on horizontal, 45-degree or 90-degree lines, on complete loops, between part-loops, between part-loops and line, and following spin elements. They may be 1/4, 1/2, 3/4, or a full 360 degrees in their rotation, up to … ................
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