Historical clue formulations

• Doohickey — 2026-02-04
• Doohickey — 2023-10-24
• Thingamajig — 2022-09-06
• Thingamajig — 2020-07-26
• Doohickey — 2018-02-07
• Whatchamacallit — 2017-08-18
• Thingamabob — 2016-04-25
• Thingamajig — 2012-09-16
• Thingamajig — 2011-06-06
• Thingy — 2010-09-01
• Contraption — 2009-10-25
• Whatchamacallit — 2008-04-27
• Thingumbob — 2007-06-10
• Doodad — 2007-03-20
• Thingamajig — 2001-08-10
• Widget — 2001-01-05
• Thingamajig — 1999-02-17