| http://www.w3.org/ns/prov#value | - Because the prop 10 a is made slightly shorter than the distance between the mine roof MR and support surface 114, compressible material 120, such as wood or other suitable material, is forced between the first bearing plate 24 or 26 and the mine roof MR so that the prop 10 a is wedged snuggly between the mine roof MR and the support surface 114.
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