US Patent: 506,261
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| Wrench
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Patentee:
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| Helfred John Rosenberg (exact or similar names) - St. Louis, MO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 08, 1893 |
| Granted: |
Oct. 10, 1893 |
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Patent Pictures:
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Helfred John Rosenberg patent October 10, 1893 |
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Stan Schulz
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Description: |
| The two sections slide in relation to each other in a dovetail slide; the "lower" section has rack teeth cut in one edge. A sliding toothed "dog" engages the rack teeth holds the adjustment. |
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