Historical clue formulations

• Chest protector — 2015-10-03
• What sticks to your ribs? — 2010-02-27
• Chest part — 2008-12-01
• It sticks to the ribs — 2007-06-10
• Rib connection — 2002-02-23
• Breastbone — 2001-05-01
• Chest protector — 1997-06-01