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US1234652A
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Pencil-sharpening device.
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US1140262A
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Method of manufacturing base-exchanging substances.
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US1117831A
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Process of removing oxygen from water.
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GB191320465A
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Process for Removing Oxygen from Water.
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CA143494A
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Production of artificial zeolite
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GB191028353A
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Process for Clarifying Water and for Purifying it form Germs.
|
|
GB190921184A
|
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Process for Removing Iron from Water and for Regenerating the Materials used for Purification.
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|
GB190708232A
|
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Process for the Manufacture of Hydrated Alumino-silicates or Artificial Zeolites.
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GB190703494A
|
|
Improvements relating to Alumino-silicates or Artificial Zeolites.
|
|
CA208968A
|
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Manufacture of allumino-silcates
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