Historical clue formulations

• Bung, e.g. — 2024-06-22
• Plug — 2018-05-20
• Cork — 2009-05-25
• Bottle cork — 2001-06-11
• Cork — 1998-03-08
• Cork in a bottle — 1995-02-07
• Cork, e.g. — 1994-11-03