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From: Doug McIlroy <doug@cs.dartmouth.edu>
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Subject: Re: [TUHS] [TUHS} More Spider
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> It might be worth mentioning that the Cambridge Ring (in the UK) used a very
> similar idea: a head end circulated empty frames which stations could fill in.

I'm quite sure the similarity is not accidental. Fraser began the Spider 
project almost immediately upon moving from Cambridge to Bell Labs.

Doug