Historical clue formulations

• Cable channels? — 2025-02-09
• Passageways — 2023-09-21
• Tear things — 2023-07-23
• Furnace/vent connectors — 2022-01-26
• Heating system network — 2017-07-29
• Passages — 2007-05-03
• Water conduits — 2006-05-02
• They bring tears to one's eyes — 2006-04-29
• Vas deferens and others — 2005-10-12
• Tear carriers — 2004-05-12
• Pipes — 2001-10-06
• Some have tears — 2001-03-04
• Where tears may be found — 1997-05-03
• Channels — 1997-03-18
• Tear channels — 1996-01-31
• Conduits — 1995-10-23
• Heating pipes — 1994-01-13