Historical clue formulations

• Elapse — 2021-05-18
• Elapse — 2019-04-23
• Elapse — 2018-09-26
• Elapse — 2010-01-04
• Appear briefly, as a parade float — 2006-04-08
• Ignore — 2002-10-15
• Ignore — 1994-03-19