US Patent: 237,594
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| Wrench
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Patentees:
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| Carl Ludwig Praeger (exact or similar names) - Philadelphia, PA |
| Hubert Francisco Praeger (exact or similar names) - South Bethlehem, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 08, 1880 |
| Granted: |
Feb. 08, 1881 |
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Patent Pictures:
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1 | 2
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C.L. Praeger and H. F. Praeger patent February 8, 1881 ... first form |
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Stan Schulz
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Description: |
| The self-adjustable jaw's adjustment is held by a spring pushing rack teeth on the shank against a spur tooth on the frame. Alternate forms with and without an intermediate shoe are shown in the drawings. |
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