| http://www.w3.org/ns/prov#value | - The pit prop as claimed in claim 6, wherein the disc elements define central apertures therein, the yielding means including an elongate locating element which is centrally connected at one end thereof to the second bearing member and on which the disc elements are slidably located via the apertures of the disc elements, and wherein the spacer element is in the form of an annular disc which is loc
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