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Application filed by Proton Villamos Gepesz GyartofiledCriticalProton Villamos Gepesz Gyarto
Priority to HU9203917ApriorityCriticalpatent/HU9203917D0/hu
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HU9203917A1992-12-111992-12-11Method for biological purification of sewage water adding chemical agents reducing phosphor and nitrogen content
HU9203917D0
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