| http://www.w3.org/ns/prov#value | - The results indicate that manufacturers are probably using greta from the same company, but it is difficult to know what this is, or what the brands or companies are that provide this type of material, as it is often acquired through intermediaries at low scale.This product is made from lead oxide, which has benefits to the manufacturers, including low cost and a low melting temperature (<990 ??C)
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