we all are on thin ice when referring to `firstsī, especially with reference to technological advances, and especially their publication. (I got this show from a just acquired brochure, and thus by accident at hand: The EBU Review - 50 Years of Television, where I found this somewhere; there is no `firstī given.)

I read somewhere that that the 50th Anniversary of television was celebrated no less than three times, depending on the expert author.