Historical clue formulations

• Drops to the ground? — 2016-11-06
• Kittens come in them — 2013-09-25
• Many viviparous births — 2011-09-30
• Leaves something behind — 2006-02-19
• Bearings? — 1997-02-28
• Befouls the path — 1997-02-15
• Ambulance equipment — 1995-06-02