Historical clue formulations

• Chevron subsidiary — 2021-10-24
• Milton Berle's longtime sponsor — 2019-10-09
• Longtime sponsor of the Metropolitan Opera — 2014-04-21
• Company with the Havoline brand — 2014-01-26
• Company in a 2001 merger with Chevron — 2013-07-28
• Fire Chief supplier — 2012-10-13
• Company with a star logo — 2008-01-27