Historical clue formulations

• Relative of a flute — 2019-06-30
• Ancient relative of a flute — 2018-10-24
• Wind instrument — 2018-10-04
• Primitive wind instrument — 2018-08-18
• Instrument whose name means "little goose" — 2013-03-22
• Light wind — 2009-12-19
• Harmonica-like instrument — 2009-05-03
• Egg-shaped instrument — 2006-10-08
• Simple wind instrument — 2001-02-25
• Wind instrument — 2000-03-03
• Ovate wind instrument — 1999-12-04
• Harmonica-like instrument — 1999-02-28
• Egg-shaped instrument — 1998-09-12
• Musical instrument with finger holes — 1997-08-03
• Sweet potato — 1996-01-01
• Wind instrument — 1995-07-16