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Rotary valve thermal oxidizer
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Patent number 5,871,349
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Issue date Feb 16, 1999
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Smith Engineering Company
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Jeffrey C. Johnson
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Throw-measuring football
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Patent number 5,779,576
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Issue date Jul 14, 1998
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Smith Engineering
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Jay Smith
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A63 - SPORTS GAMES AMUSEMENTS
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Video game controller
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Patent number D348083
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Issue date Jun 21, 1994
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Smith Engineering
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Jay Smith
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D21 - Games, toys, and sports goods
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Video gun
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Patent number D338690
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Issue date Aug 24, 1993
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Smith Engineering
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Jay Smith
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D21 - Games, toys, and sports goods
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