US Patent: 1,510,593
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| Screw driver
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Patentee:
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| Harvey J. Harrold (exact or similar names) - Columbiana, OH |
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Patent Dates:
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| Applied: |
Aug. 04, 1923 |
| Granted: |
Oct. 07, 1924 |
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Patent Pictures:
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Patent 1,510,593 - edited drawing |
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Stan Schulz
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Description: |
| Combination of "sinuous" handle core and "stiff electrically resistant" material for the handle; trade journal listings and "SHOK-PRUF" trademark registration are evidence Harrold put this design into production. |
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