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german gold refining machine

The guard pot, with the clay pot in it containing or ozs of fused borax, is placed in the furnace, and is heated gradually until the bottom of the clay pot is dull red the ingots of which the larger are slippershaped to be refined, amounting in all to to ozs in weight, are then placed loosely in the pot, the furnace filled with fuel, and the dampers opened as soon as the

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Zhengzhou High-tech Zone, China

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