US Patent: 2,656,751
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| Replaceable Jaw Insert for Pipe Wrenches
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Patentees:
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| Walter J. Johnson (exact or similar names) - Buffalo, NY |
| Carl G. Ertell (exact or similar names) - Eggertsville, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 14, 1950 |
| Granted: |
Oct. 27, 1953 |
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Patent Pictures:
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Walter J. Johnson and Carl G. Ertell patent October 27, 1953 |
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Stan Schulz
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Description: |
| The focus of the patent is hard inserts for lightweight wrenches made of aluminum alloy or similar light, soft metal. The specifications contain a longish discussion of metallurgy.
Fraser, Myers & Manley - patent attorneys
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