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U.S. Pat. No. 190,459

U.S. Pat. No. 190,459

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A 3D model showcases U.S. Pat. No. 190,459 - revolutionary 1877 screwdriver handle technology straight from the original database of innovations - the U.S. PTO. "To all who may be concerned: Be it known that I, HENRY WILKINSON, of Collinsville, in Hartford County and Connecticut State, have created significant new and practical Improvements in Screw-Driver Handles..."

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