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Donald J. Smolenski
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St. Clair Shores, MI, US
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last 30 patents
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Patent Grant
Automatic engine oil change indicator system
Patent number
4,847,768
Issue date
Jul 11, 1989
General Motors Corporation
Ellen S. Schwartz
B60 - VEHICLES IN GENERAL
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Patent Grant
Automatic engine oil change indicator system
Patent number
4,742,476
Issue date
May 3, 1988
General Motors Corporation
Ellen S. Schwartz
G07 - CHECKING-DEVICES