| http://www.w3.org/ns/prov#value | - An unduly long operating shaft on the tap changer switch may present functional problems, as at least theportion of the shaft'to which the movable contact member is fixed must be formed of an insulating material, such as wood or a synthetic resin material, which may warp, bend or twist if supported only at its extreme inner end and at the tank wall, and actu- SUMMARY OF THE INVENTION Briefly, the
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