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David C. Shifflett
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Mt. Clemens, MI, US
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last 30 patents
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Patent Grant
Manifold
Patent number
4,631,212
Issue date
Dec 23, 1986
Al-Ko Products, Inc.
David C. Shifflett
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Patent Grant
Teaching apparatus
Patent number
4,592,731
Issue date
Jun 3, 1986
Al-Ko Products, Inc.
David C. Shifflett
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS