| http://www.w3.org/ns/prov#value | - IGS. 1, 2, and 3, numeral 1 denote a sign of rectangular, square or other shape, made of any suitable material, such as aluminum, Corten steel, or other metal or alloys, wood or even plastic material and having the entire perimeter 1a disposed at an angle of about 45?? or less with respect to the extension of the plane of sign 1 (see Hg. 3).
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