| http://www.w3.org/ns/prov#value | - The covers -1 and 2 may be of any size or material, such as stiff card-board or wood, and may be covered with any suitable material, 'such as leather, cloth or aper, to add to the neat appearance of the older, and to provide means for receiving ornamentation or configuration of any de-' scription which will further. add to the these abutments -8, characteristic appearance of the device, althoug
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