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US4099019A
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Electric furnace waste heat recovery method and apparatus
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Apparatus for cleaning furnace gas discharge pipe
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Improvements in and relating to discharge of waste gases from electric furnaces
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Improvements in and relating to discharge of waste gases from electric furnaces
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Closed type electric furnace
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Electric furnace having dust removing means invent pipes
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A closed type electric furnace having a heat resistant poking device
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Electric furnace
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Heat-resisting poking device
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Electric furnace
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Electric furnace having dust removing means in vent pipes
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