| http://www.w3.org/ns/prov#value | - As the term glass" is used in this invention, it will be understood to mean and include any amorphous inorganic transparent or translucent substance formed by fusion of sand, silica or other materials to produce a mass that cools to a rigid condition without crystallization, or any of the various inorganic or organic substances resembling glass in transparency, hardness and amorphous nature, as l
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