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Mystery Gearbox
Top marks David.
I often wonder how the draughtsman fathomed how to get the innards out of later boxes. Would be a task even with computer manipulation. Decades since I last did but Something of a puzzle even in the flesh.
Part of my engineering training, even in the late 70's / early 80's, was modelling parts from thin card. It was considered an essential skill, though it has never been called upon in my career. Nowadays 3D printing has taken over.

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