US Patent: 3,304,817
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| Wrench with Concave Jaw Teeth
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Patentees:
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| John E. Swanstrom, Jr. (exact or similar names) - Duluth, MN |
| Swan Elmer Swanson (exact or similar names) - Duluth, MN |
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Patent Dates:
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| Applied: |
Feb. 26, 1965 |
| Granted: |
Feb. 21, 1967 |
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Patent Pictures:
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John E. Swanstrom, Jr. and S. Elmer Swanson patent February 21, 1967 |
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Stan Schulz
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Description: |
| The patented features include technical details of the shape of the face which facilitate sharpening, as the main wear points on the teeth are the outer edges of the jaws.
Known examples with the patent number include "Diamalloy Diamond Tool and Horseshoe Co. Duluth, U.S.A."
Patent nos. 514,721, 722,144, 944,468, 1,522,804, 1,824,944 and 2,795,986 are listed as references.
Schroeder, Siegfried & Ryan - patent attorneys
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