Historical clue formulations

• Popular farm vehicles — 2025-08-09
• Some farm machines — 2024-08-11
• Many mowers — 2018-02-18
• Some farm vehicles — 2016-11-26
• Some farm machines — 2013-06-05
• Some harvesters — 2011-11-20
• Popular tractors — 2010-12-22
• Some riding mowers — 2010-06-06
• Some tractors — 2008-04-01
• Some combines — 1996-12-12
• Some lawn mowers — 1994-10-16