Workshop Technology
The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

Combination set
Inside micrometer
Depth gauge micrometer
Outside micrometer

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Workshop Technology
Swab is used for

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

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