Season 23 · Episode 4
Railway Bridge Ties, Membrane Filters, Hydraulic Post Drivers, Bi-Planes
Heavy timbers are cut, drilled and treated for use as railway ties on bridges. Selective membranes are formed and installed in filtration units; hydraulic mechanisms are assembled into machines that drive posts into the ground; and wooden or metal airframes, wings, control surfaces and engines are brought together to build biplanes.
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