Television detector vans in the UK (used to enforce television licenses though there’s some dispute about whether the vans actually worked or were just a deterrent).
From top to bottom: 1950s Hillman Minx detector car and van, 1980s Dodge detector van.
Images from the BBCs Ceefax service, an teletext service distributed over the TV band from 1974-2012.
Screenshots via: the fantastic and extensive Teletext Gallery
The BBC’s “Test Card F“, featuring an eight-year-old Carole Hersee and her stuffed clown Bubbles. The card was used between July 2, 1967 and sometime in 1998. Most interesting is the card aired for more than 70,000 hours, or nearly 8 years; trapped in this stasis of tribal abstraction and in absolute stillness, Carole and her toy both seem like a paralyzed person, capable of rapid and inquisitive thought but physically unable to move or communicate the fruit of their long meditation.