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Small pack of timber consisting of a number of timbers laid side by side
to form a solid mass 2 to 2-1/2 ft square by 4 to 6 in thick (approx. 0.7
m square by 10 to 15 cm thick). Holes are drilled edgeways through the
mat, and wires are threaded through to hold it together. Mats are
transported underground and built up to form very effective supports.
Spalding
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