US Patent: 1,371,491
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| Wrench
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Patentee:
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| David Clinton Kerr (exact or similar names) - Flint, MI |
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Patent Dates:
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| Applied: |
May 19, 1920 |
| Granted: |
Mar. 15, 1921 |
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Patent Pictures:
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1 | 2
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David Clinton Kerr patent March 15, 1921 |
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Stan Schulz
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Description: |
| Auxiliary jaw insert on a spring extension, to provide multiple sizes on a single double open end wrench. Known examples may have single or double sets of these auxiliary inserts, but do not have the screwdriver blade shown in the drawings. |
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