From a traffic flow point of view, the hole in the support on the far side of the box was occupied by a machine bolt with a nut loosely screwed into the end.

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Those who had worked on Apollo - who intimately knew every nut and bolt - were left gasping at what they'd accomplished.

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"He was one of these people who had ideas and he had this sudden idea that it would be educationally rather good to put together a geometric system whereby you could nut and bolt things together, " he said.

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