US Patent: 1,613,981
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| Wrench
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Patentee:
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| August Edwin Carlberg (exact or similar names) - Worcester, Worcester County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 10, 1924 |
| Granted: |
Jan. 11, 1927 |
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Patent Pictures:
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August E. Carlberg patent January 11, 1927 |
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Stan Schulz
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Description: |
| Spring / ball retaining means for rotating socket heads; Carlberg's prior patents 1,542,336 and RE,16,354 are the underlying wrench structure.
Compare W. S. Bellows' parallel patent no. 1,613,976 also assigned to Walden-Worcester. |
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