Historical clue formulations

• Unit of magnetic flux density — 2025-05-11
• Kind of radiation — 2024-09-26
• Like electromagnetic radiation with the shortest wavelength — 2023-07-21
• Kind of ray — 2023-03-16
• Delta follows it — 2022-12-02
• Third-tier caste member in "Brave New World" — 2021-06-05
• Delta preceder — 2020-05-24
• Like emissions from some 40-Down — 2014-11-08
• Letter after beta — 2010-08-16
• Gallows-shaped letter — 2009-10-14
• Letter after beta — 2009-05-11
• ___ radiation — 2008-03-30
• Letter after beta — 2007-02-26
• Beta follower — 2006-07-26
• Kind of ray — 2005-11-20
• Alpha, beta, ___ … — 2005-10-17
• Letter before delta — 2003-05-05
• Beta's follower — 2002-04-22
• Beta's follower — 1999-06-28
• Beta's follower — 1998-11-30
• Kind of radiation — 1997-01-10
• Symbol of magnetic field strength — 1996-10-24
• Delta preceder — 1995-07-03
• Kind of ray — 1994-11-14