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Although items hand-plated with metal leaf date back to ancient times , large scale production dates to 1742 when Thomas Boulsover , of Sheffield , England developed a process by which silver plates were fused to base metal ( generally copper ) ingot s by heating them in a furnace with borax .
 Thomas Boulsover, Sheffield, England
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Thomas Boulsover, Sheffield, England