Historical clue formulations

• Rubber gaskets — 2020-11-23
• Redundant-sounding engine parts — 2017-10-29
• Scuba tank parts — 2012-09-09
• Some gaskets — 2010-04-15
• Rubber gaskets — 2009-07-16
• Annular seals — 2007-07-06
• Rubber gaskets — 2006-05-07
• Scuba gear gaskets — 2005-02-27
• Rubber gaskets — 2003-04-13