Historical clue formulations

• Bit of letter-shaped hardware — 2025-12-07
• Circular gasket — 2024-07-09
• Letter-shaped gasket — 2023-02-16
• Torus-shaped gasket — 2022-08-14
• Certain gasket — 2021-11-07
• Gasket variety — 2015-01-11
• Certain gasket — 2012-10-11
• Part of an airtight seal — 2012-05-22
• Circular gasket — 2011-11-22
• Canning seal — 2011-08-28
• *Gasket type — 2011-01-23
• Circular gasket — 2010-12-15
• Rubber gasket — 2008-12-28
• Space shuttle gasket — 2008-10-21
• Circular gasket — 2008-10-12
• Circular gasket — 2008-02-11
• Circular seal — 2007-12-12
• *Certain gasket — 2007-02-04
• Circular seal — 2007-01-10
• Certain NASA equipment … shown literally in the solution to this puzzle — 2005-08-11
• Certain gasket — 2004-06-30
• Space shuttle gasket — 2004-05-03
• Gasket — 2004-03-10
• Circular gasket — 2004-01-14
• NASA gasket — 2003-12-04
• Gasket — 2002-02-03
• NASA gasket — 2001-07-18
• Rocket gasket — 2000-11-20
• Space shuttle part — 1999-04-20
• Neoprene gasket — 1998-10-04
• Rubber gasket — 1997-08-10
• Rocket gasket — 1997-05-25
• Bit of NASA equipment — 1997-03-30