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  2. Refining (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Refining_(metallurgy)

    In one of the previous melting stages, lead was added. Gold and silver preferentially dissolved in this, thus providing a means of recovering these precious metals. To produce purer copper suitable for making copper plates or hollow-ware, further melting processes were undertaken, using charcoal as fuel. The repeated application of such fire ...

  3. Cupellation - Wikipedia

    en.wikipedia.org/wiki/Cupellation

    16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.

  4. Worthington Enterprises - Wikipedia

    en.wikipedia.org/wiki/Worthington_Enterprises

    Worthington Enterprises, Inc. is a global diversified metals manufacturing company based in Columbus, Ohio.It is a steel processor and manufacturer of pressure vessels, such as propane, oxygen and helium tanks, hand torches, refrigerant and industrial cylinders, camping cylinders, exploration, recovery and production products for global energy markets; water system tanks for storage, treatment ...

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  6. Marble Cliff Quarry Co. - Wikipedia

    en.wikipedia.org/wiki/Marble_Cliff_Quarry_Co.

    In 1985, the Kaufmans sold the 2,000-acre (8.1 km 2) quarry to investors who filled in and developed the quarry for residential use, including Marble Cliff Commons [6] [2] [3] apartments and Marble Cliff Crossing, a 100 single-family and 60 double-family subdivision built between 1998 and 2003. [7]

  7. Franklin Art Glass Studios - Wikipedia

    en.wikipedia.org/wiki/Franklin_Art_Glass_Studios

    James Helf in the Oak Street studio Inside the Sycamore Street studio in the early 1970s. Franklin Art Glass Studios, Inc. was founded in 1924 with three principals, Wilhelm Kielblock, Wilhelm Kielmeier, and Henry ‘Elmore’ Helf.

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  9. Silversmith - Wikipedia

    en.wikipedia.org/wiki/Silversmith

    In the ancient Near East (as holds true today), the value of silver was lower than the value of gold, allowing a silversmith to produce objects and store them as stock. Historian Jack Ogden states that, according to an edict written by Diocletian in 301 A.D., a silversmith was able to charge 75, 100, 150, 200, 250, or 300 denarii per Roman ...

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