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Carl R. Douglass, III
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Willmar, MN, US
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last 30 patents
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Patent Grant
Pipe rib gasket
Patent number
D650053
Issue date
Dec 6, 2011
Prinsco, Inc.
Carl R. Douglass, III
D23 - Environmental heating and cooling
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Patent Grant
Corrugation saddle gasket
Patent number
D644306
Issue date
Aug 30, 2011
Prinsco, Inc.
Carl R. Douglass, III
D23 - Environmental heating and cooling