Historical clue formulations

• E, in a code — 2026-03-27
• Morse bit — 2025-06-04
• Morse code click — 2024-05-26
• Dah's counterpart, in Morse code — 2023-04-18
• E, in Morse code — 2021-09-26
• Bit of Morse code — 2021-02-21
• E, in Morse code — 2020-11-03
• Telegraph "e" — 2019-10-03
• Morse bit — 2014-06-19
• Morse bit — 2013-12-27
• Dah's counterpart in Morse code — 2012-03-05
• Dah's go-with — 2011-09-22
• Dah's counterpart — 2008-12-23
• Telegraphed sound — 2006-02-08
• Morse bit — 2005-08-25
• Morse code tap — 2004-12-10
• Morse tap — 2003-11-13
• Telegraphic click — 2003-04-24
• One-quarter of an H, in Morse code — 2001-06-09
• Telegraph sound — 2000-11-26
• Morse minimum — 2000-05-28
• Morse code click — 1999-11-28
• Morse minimum — 1999-06-17
• Dah's go-with — 1999-05-04
• Dah's partner — 1998-12-28
• Morse code click — 1998-12-06
• Dah's partner — 1998-08-12
• Morse tap — 1998-05-16
• E, in Morse — 1997-12-17
• Morse code click — 1997-06-09
• Code word — 1997-02-23
• Radio code sound — 1996-12-01
• Dah's partner — 1995-09-12