US Patent: 825,401
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| Wrench
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Patentee:
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| John Merckens (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Dec. 05, 1904 |
| Granted: |
Jul. 10, 1906 |
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Patent Pictures:
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John Merckens patent July 10, 1906 |
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Stan Schulz
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Description: |
| The patent is for the laminated construction whereby the gripping parts of tempered steel are reinforced by tougher less brittle material. The thread cutters are a separate patent -- No. 828,859 (the drawings are nearly identical!!). The resulting tool with laminated construction is marked "PERPETUAL GRIP ALL PARTS RENEWABLE."
See also patent no. 816,570 for another Edmonds-Metzel alligator wrench design. |
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