Historical clue formulations

• Powers (down) — 2024-07-31
• Closes — 2024-03-04
• Stops talking, with "up" — 2021-06-13
• Closes — 2020-02-10
• Closes — 2020-02-09
• Closes — 2019-02-11
• Closes — 2018-04-11
• Latches, say — 2015-10-11
• Bars — 2010-07-04
• Latches — 2010-05-02
• Puts out of business — 1999-08-25
• Bars — 1998-07-26
• Secures — 1995-04-02