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David L. Roberts
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Brooklyn Park, MN, US
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last 30 patents
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Patent Grant
Integral fluted tube for sound suppression and exhaust ejection
Patent number
4,580,657
Issue date
Apr 8, 1986
Donaldson Company, Inc.
Steven D. Schmeichel
F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES