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John R. Spelman

📍 Glen Arm, MD: #15 of 39 inventorsTop 40%
🗺 Maryland: #13,387 of 35,612 inventorsTop 40%
Overall (All Time): #1,975,420 of 4,157,543Top 50%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
9586122 Golf putting trainer device Trevor Alan Wade 2017-03-07
8968113 Golf putting trainer device Trevor Alan Wade 2015-03-03