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Bowling pin of synthetic material
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Patent number 4,971,322
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Issue date Nov 20, 1990
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Jager; Arnold
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Andreas Jager
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Apparatus for aerating water
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Patent number 4,929,397
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Issue date May 29, 1990
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Jager; Arnold
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Andreas Jager
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Device for aerating water
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Patent number 4,849,139
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Issue date Jul 18, 1989
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Jager; Arnold
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Andreas Jager
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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