Historical clue formulations

• Locks up — 2025-12-01
• Enclosures for shark watchers — 2023-01-30
• Pens — 2022-02-20
• Pet shop purchases — 2017-03-31
• Bar rooms? — 2013-06-14
• Zoo enclosures — 2013-02-18
• Aviary supply — 2010-11-06
• Locks up — 2005-02-11
• They may be rattled — 1999-02-07
• Pens — 1997-10-12
• Shark watchers' protectors — 1997-09-09
• Batting equipment — 1994-11-27
• Old elevator cars — 1993-11-28