I first noticed that Technos model in a 1974 magazine text ad for Jim Alexander Enterprises, of S. Houston TX. I then did some online searching for more info about it.
It is also mentioned in Charles Garrett's early editions of his Successful Coin Hunting book. In my '78 & '79 copies, it's on pages 180 & 181. He has a couple of paragraphs about it, mostly quite favorable. The book also has a picture of Jim Alexander using it. But he makes no mention of the TID display. Charles also claims that it was actually an IB model, not a TR as I said in the 1st post. That TR designation came from the 1st comments which I read.
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