Historical clue formulations

• Production co. behind "Rhoda" and "Newhart" — 2020-08-16
• ___ Enterprises (bygone TV production company) — 2017-04-27
• Co. that produced "Lou Grant" — 2015-05-17
• 1970s sitcom production co. — 2015-05-03
• "Newhart" production co. — 2014-11-01
• "Hill Street Blues" production co. — 2012-12-01
• '70s TV production co. — 2012-11-11
• "Lou Grant" production co. — 2012-03-25
• '70s TV production co. — 2011-12-25
• 1970s TV production co. — 2009-10-18
• "Lou Grant" production co. — 2009-09-05
• '70s TV production co. — 2009-05-28
• '70s sitcom producer — 2007-07-08
• Big inits. in 1970's TV — 2006-01-28