US Patent: 2,647,425
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| Self-adjusting wrench for nuts and like polygonal objects
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Patentee:
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| Svend Olaf Mortensen (exact or similar names) - Copenhagen, Denmark |
| USPTO Classifications: |
| 81/91 |
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Patent Dates:
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| Applied: |
Nov. 15, 1947 |
| Granted: |
Aug. 04, 1953 |
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Patent Pictures:
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Patent 2,647,425 - edited from PATENT GAZETTE |
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Stan Schulz
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Description: |
| Refinement of the self-adjusting design in 2,570,991 and corresponding "foreign" patents.
CROMNA wrenches were produced in Europe and Britain; they were available in Canada, and possibly imported into the U.S. Catalog listings etc. show four sizes. |
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