Assertion: tv | /r/HasProperty | sold by baird
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Source sentences:
text: The earliest commercially made televisions sold by Baird called Televisors in the UK in 1928 were radios with the addition of a television device consisting of a neon tube behind a mechanically spinning disk (patented by German engineer Paul Nipkow in 1884) with a spiral of apertures first mass-produced television set, selling about a thousand units.