Historical clue formulations

• TV programming filter — 2019-06-04
• TV blocking device — 2018-02-04
• TV blocking device — 2017-08-22
• Blocker working with a receiver — 2013-12-13
• Program blocker — 2012-12-21
• Modern screening device — 2011-03-16
• TV blocking device — 2010-10-13
• *Show stopper? — 2007-02-04
• Screening device — 2006-08-18
• TV monitor? — 2004-05-28
• TV screening device — 2003-11-11
• Program blocker — 2003-10-18
• TV monitor, of sorts — 2003-10-15
• Screening device — 2001-01-19
• TV monitor of sorts — 2000-11-23