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Paul R. Erwin

Dallas, TX: #4,358 of 7,543 inventorsTop 60%
Texas: #73,555 of 125,132 inventorsTop 60%
Overall (All Time): #4,061,802 of 4,157,543Top 100%
1 Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4419080 Method and apparatus for teaching grammar — 1983-12-06

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