US2046156A
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Return bend for oil stills
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US1962863A
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Return bend for cracking coils in oil stills
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US2046155A
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Return bend
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US2024347A
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Return bend fitting
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US1926670A
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Elbow
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US1874004A
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Return bend fittings for oil stills
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US1868164A
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Return bend fittings for oil stills
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US1874003A
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Housing for return bends
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US1936386A
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Return bend fitting for oil stills
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US2072669A
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Return bend fitting for oil stills
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US1843125A
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Return bend
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US1866636A
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Return bend
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US1841577A
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Return bend
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US1752332A
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Clean-out elbow for cracking stills, etc.
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US1752331A
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Return bend
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US1874002A
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Oil burner
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