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US2550814A
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Recovery of tar acids from coal oils or tars
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GB647487A
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Improvements relating to the recovery of tar acids from coal oils or tars
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GB644023A
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Improvements in and relating to a method and apparatus for discharging solid fuel from retorts
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GB636602A
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Improvements relating to the production of pitch mastic
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GB629680A
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Improvements in and relating to charging skips for retorts
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GB648752A
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Improvements in and relating to a method and apparatus for the recovery of phenols from aqueous liquors
|
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GB621639A
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Improvements in or relating to the refining of tar acids
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US2526459A
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Tunnel oven for thermolytic distillation
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GB589335A
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Improvements relating to the production of disinfectant fluids
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GB601904A
|
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Production and manufacture of resinous products from phenolic oils
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GB601905A
|
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Improvements relating to the production of synthetic bitumens
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GB642641A
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Improvements in and relating to heating furnaces, drying ovens, kilns and the like
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GB590635A
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Improvements in and relating to the refining of oils
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GB579561A
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Improvements relating to the distillation of solid carbonaceous substances
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GB487330A
|
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Improvements relating to paper and like bags and like containers
|
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US2143972A
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Setting of retorts for use in the distillation of solid carbonaceous substances
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US2143973A
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Setting of retorts for use in the distillation of solid carbonaceous substances
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GB445102A
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Improvements relating to paper and like bags and like containers
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GB442750A
|
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Improvements relating to paper and like bags and like containers
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GB443899A
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Process for treating ammoniacal liquors
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