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Unix borrowed much of its architecture from Multics, so it would be fair to say that K&R borrowed quite a few ideas too. The history of the evolution of electronic computing has been defined by the borrowing of previously demonstrated ideas and incorporating them into an evolutionary leap forward.
The oldest electronic digital computer, the fourth in the world, the idea of hard disk storage and random access memory all originated in Australia in the form of CSIRAC which is the oldest surviving digital computer in existence. That doesn't take away from advances that followed it, however saying Richie was wholly original in his ideas for C & UNIX is historically and factually wrong.
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