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Keith Johnson
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Bartlett, IL, US
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last 30 patents
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Patent Grant
System and method for providing enhanced amusement game tournament...
Patent number
7,967,681
Issue date
Jun 28, 2011
Stern Pinball, Inc.
Lonnie D. Ropp
G07 - CHECKING-DEVICES
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last 30 patents
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Patent Application
System and method for providing enhanced amusement game tournament...
Publication number
20050288803
Publication date
Dec 29, 2005
Stern Pinball, Inc.
Lonnie D. Ropp
G07 - CHECKING-DEVICES