Historical clue formulations

• Unit associated with waves — 2023-01-19
• One cycle per second — 2021-12-25
• First person to broadcast radio waves — 2019-01-18
• Bandwidth unit — 2018-12-15
• Dollar alternative — 2016-12-28
• Alternative to Enterprise — 2016-04-19
• Frequency unit — 2015-07-10
• Avis rival — 2015-03-02
• Enterprise rival — 2008-11-27
• National alternative — 2008-11-13
• #1 to Avis's #2 — 2007-06-11
• Alamo competitor — 2007-01-30
• Avis rival — 2006-08-07
• Frequency unit — 2006-06-13
• Frequency unit — 2006-02-28
• Thrifty competitor — 2003-05-02
• One cycle per second — 2002-12-22
• Nobelist for whom a physics unit is named — 2002-06-02
• Avis rival — 2002-01-14
• Budget alternative — 2000-06-11
• Frequency unit — 1997-01-10
• Budget alternative — 1995-06-07
• Airport booth leaser — 1995-02-14