To be safe, the art should be before 1990.
The 1990 post is interesting from the berkley guy, it might be early enough too.. but the problem is that in my understanding this does not HAVE to invalidate their patent or some of their claims, since its just someone inventing it, having the idea, just like they had the idea... They were just sooner to patent it.
The other post about the test from GTE does not help, its fixed lines, the point of the patent from acacia IS to have non-fixed lines.
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