| http://www.w3.org/ns/prov#value | - The materials employed for this purpose are almost innumerable, and we find wood, copper, lead, zinc, porcelain, Roman cement, Portland cement, leather, tin, yellow metal, india-rubber, tinned iron, woven metal and vegetable fabrics, brass, glass, plaster, &c. &c.; in fact, it would seem that almost everything had at one time or other been pressed into the service.
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