| http://www.w3.org/ns/prov#value | - In laying pipe, such as in gas or oil pipeline, it s conventional that lengths of pipe are supported end to end on stacked lumber pieces known as ???skids??? so that the pipe lengths can be held at a required height to be supported and aligned end to end for welding of the lengths, prior to feeding of the completed welded length into a trench adjacent to the stacks.
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