Historical clue formulations

• ___-Barbera (onetime cartoon company) — 2021-03-02
• Cartoonist William who co-created Tom and Jerry — 2017-12-01
• Boo Boo Bear's co-creator — 2014-03-14
• Yogi Bear co-creator — 2013-03-02
• Co-creator of "The Flintstones" — 2012-02-02
• Half of an animation duo — 2007-11-25
• ___-Barbera cartoons — 2006-07-04
• Big name in TV cartoons — 2005-05-05
• Scooby Doo's co-creator — 2004-12-19
• Half of a noted cartoon duo — 2003-11-02
• Barbera's partner in cartooning — 2000-02-15
• ___-Barbera (big name in cartoons) — 1999-01-05
• One of Yogi Bear's creators — 1998-02-26
• Barbera's partner in cartoons — 1997-04-18