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Hans-Hugo Spelsberg
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Osnabruck, DE
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last 30 patents
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Patent Grant
Filling for percolating filters for biological waste water purifica...
Patent number
4,451,362
Issue date
May 29, 1984
Felix Schoeller, Jr., GmbH & Co., K.G.
Hans-Hugo Spelsberg
C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE