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Coke-oven door
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Patent number 4,381,972
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Issue date May 3, 1983
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WSW Planungs-GmbH
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Wilhelm Stog
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
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Floating jet aerator
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Patent number 4,350,589
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Issue date Sep 21, 1982
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WSW Stahl- und Wasserbau GmbH
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Wilhelm Stog
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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