Hello again,
Here are the three early advertisements I know about. They were published in Electronics magazine between May and December 1955... [...]
Oh yes, the article from Mr Ciardiello, see it here: http://www.radiomuseum.org/forum/nixie_and_trochotron_haydu_vs_burroughs.html
How do you know when they were published, did I miss something in the article?
These ads, along with the bulletins you have on your site, are the earliest known evidence for the beam switching tube and Nixie. They're all dated 1955.
Hmm, I guess that's something. But you know, whenever a distance between two things is measured, it is important to keep the error low ;-) So all we can say is that the Inditron was not introduced later than September 1954, and that the Nixie tube was not introduced later than December (or May) 1955.
But something bugs me: I have searched for "inditron" at Google books, and they were some documents from 1950 that had "inditron tube" in them. Isn't that weird?
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