| http://www.w3.org/ns/prov#value | - Street signs of the kind mentioned, are usually made of wood or other material which is subject to the corrosive action of the elements, and which dov not last long in service, but have to-be frequently renewed. lVhere signs of this class are used where opposite sides of the sign must display an inscription, signs on separate boards or plates placed back to back have been employed, in which case t
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