US Patent: D421,888
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| Ratcheting Screwdriver Handle
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Patentees:
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| Mark J. Knapp (exact or similar names) - Kenosha, WI |
| Joseph R. Hoepfl (exact or similar names) - Greenfield, WI |
| Christopher D. Thompson (exact or similar names) - Milwaukee, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 20, 1999 |
| Granted: |
Mar. 28, 2000 |
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Stan Schulz
Snap-On Tools Company History
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Description: |
| Emrich & Dithmar - patent attorneys
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