Historical clue formulations

• Arnaz and Ball's production company — 2013-03-26
• 1950s-'60s TV studio — 2011-02-21
• Big production company in 1950s-'60s TV — 2010-03-21
• Studio behind the original "Star Trek" — 2008-09-07
• 1957 RKO purchaser — 2007-12-15
• Arnaz and Ball's studio — 2004-01-20
• Ball's production company — 1995-11-12