Historical clue formulations

• Some track-and-field races — 2023-01-29
• Pass-the-baton track events — 2016-09-05
• Pony Express riders, e.g. — 2016-01-24
• Track races with legs — 2015-06-08
• Pass-the-baton events — 2014-02-10
• Some races — 2011-01-06
• Track events — 2006-12-21
• Pony Express segments — 2005-12-10
• Devices in electrical networks — 2005-11-20
• Circuit breakers — 2004-02-05
• Communications satellites — 1999-01-24
• Imparts — 1998-01-23