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The deformation of the coal or ore pillars is estimated by monitoring the
closure of the entry. This roof-to-floor convergence is generally measured
with a tube extensometer, to an accuracy of 0.001 in (25.4 mu m), or a
tape measure, to an accuracy of 0.01 ft (3.048 mm). Measurements are
repeatedly taken as the mining geometry changes. SME, 1
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