Historical clue formulations

• Spinning speed: Abbr. — 2023-10-12
• Rotational speed meas. — 2021-06-15
• Rotational speed meas. — 2015-12-31
• Spin meas. — 2011-11-13
• Rotational speed meas. — 2009-12-29
• Turning meas. — 2009-10-30