US Patent: 640,308
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| Wrench
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Patentee:
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| Henry E. Koch (exact or similar names) - Hartington, NE |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 22, 1899 |
| Granted: |
Jan. 02, 1900 |
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Patent Pictures:
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Henry E. Koch patent January 2, 1900 |
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Stan Schulz
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Description: |
| Variations of clamping jaws which are tightened by a screw withdrawing from the end of the handle, connected to the jaws by an intermediate link. The jaws could have teeth for pipe, or be used for blacksmith tongs. |
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