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JH

John A. Helmsderfer

East Liverpool, OH: #1 of 3 inventorsTop 35%
Ohio: #1,649 of 5,836 inventorsTop 30%
Overall (2003): #193,499 of 273,478Top 75%
1 Patents 2003

Issued Patents 2003

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
6619734 Child support device with displaceable seat element — 2003-09-16

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