I've been punching blocks for quite a few years. Can't remember (if I knew in the first place) why they call them "66" and "110" type blocks. I've seen a couple of guesses at this one, but I haven't found any definite answers. (One somebody said it was because they were invented around 1966!? I doubt whether that's where the term came from.) ATT created the "66" type block, I remember. Just don't recall....
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