Historical clue formulations

• Bat for hitting practice fly balls — 2018-12-18
• Ball hit for fielding practice — 2018-04-08
• Bat used for fielding practice — 2009-07-15
• Stick used to swat flies — 2007-02-25
• Fielding practice ball — 1998-08-26
• Baseball practice — 1993-12-22