Workshop Technology
Tandem drawing of wires and tubes is necessary because

Annealing is needed between stages
It is not possible to reduce at one stage
Surface finish improves after every drawing stage
Accuracy in dimensions is not possible otherwise

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Workshop Technology
Swab is used for

Cleaning the moulding sand
Reinforcement of sand in the top part of the moulding box
Moistening the sand around the edge before removing pattern
Smoothing and cleaning out depressions in the mould

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