Historical clue formulations

• Certain wings — 2025-12-27
• 90° angles — 2025-04-14
• Building annexes — 2023-03-14
• Couple of llamas? — 2023-01-08
• Building extensions — 2022-07-18
• Yellow belly? — 2021-11-21
• What jelly rolls are filled with? — 2021-10-07
• Wings — 2020-04-24
• Some pipe joints — 2019-11-10
• Some plumbing joints — 2019-03-31
• Building annexes — 2018-01-29
• Lawful ends? — 2017-07-21
• Bracket shapes — 2017-04-23
• The black square chunk in front of 55-, 60- and 63-Across, and others — 2017-04-18
• Some pipe joints — 2015-10-04
• Duckbill's tail? — 2015-08-27
• Some add-ons — 2015-07-29
• Blueprint additions — 2015-04-11
• Right-angled additions — 2015-03-31
• Pieces with 90-degree bends — 2014-11-03
• Right-angle bends — 2014-03-10
• Some wings — 2013-12-22
• Some brackets — 2012-09-28
• Corner shapes — 2012-01-31
• Some annexes — 2010-01-05
• Direction-changing pipes — 2009-02-06
• Right-angle joints — 2008-12-16
• Building additions — 2008-10-27
• 90 degree pipe joints — 2008-09-15
• Building additions — 2008-06-18
• Building extensions — 2008-05-20
• Wings — 2008-04-05
• Wright wings — 2007-12-30
• Architects' annexes — 2007-12-25
• Right angles — 2007-05-08
• Building additions — 2006-10-30
• Room extensions — 2006-10-11
• Some wings — 2006-07-16
• Right-angle bends — 2006-06-27
• Some add-ons — 2006-03-22
• Some bent pipes — 2006-01-13
• Building annexes — 2004-11-08
• Turning points — 2004-08-15
• Building additions — 2004-06-21
• Conduit bends — 2004-01-28
• Wings — 2003-10-31
• Some joints — 2003-03-07
• Corner pieces — 2002-11-28
• Wings — 2002-06-20
• New wings — 2002-05-14