Historical clue formulations

• Baseball pitch that suddenly drops — 2017-09-05
• Fishing item — 2017-05-14
• Deceptive pitch — 2016-04-24
• Hook, line and ___ — 2009-09-07
• Tackle box item — 2004-03-10
• Tricky pitch — 2002-01-30
• Plumbers' favorite fishing item? — 1996-11-20