Historical clue formulations

• Major arteries — 2025-08-06
• Main arteries — 2025-05-05
• Lines connected to pumps? — 2024-06-09
• Some circulation channels — 2019-08-15
• Ticker lines? — 2019-04-21
• Inner tubes? — 2018-02-25
• Blood lines — 2016-10-28
• Major vessels — 2016-09-14
• Outlets for some small pumps — 2013-09-04
• Big blood vessels — 2013-07-09
• Main lines — 2010-05-18
• Main lines — 2010-02-16
• Lifelines? — 2009-09-15
• Arterial trunks — 2009-01-26
• Trunk lines — 2007-03-11
• Main arteries — 2006-03-20
• Main lines — 2006-03-05
• Main arteries — 2005-12-13
• Main arteries — 2005-05-31
• Main arteries — 2004-08-23
• Arterial trunks — 2004-08-17
• Main lines — 2003-01-22
• Cardiologists' concerns — 1999-05-02
• Vital passages — 1996-01-20
• Ventricles' outlets — 1994-11-27