US Patent: 817,695
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| RADIATOR-VALVE UNION NIPPLE-WRENCH.
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Patentees:
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| Fred Engle (exact or similar names) - Oshkosh, WI |
| Louis W. Dukerschein (exact or similar names) - Oshkosh, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 05, 1905 |
| Granted: |
Apr. 10, 1906 |
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Patent Pictures:
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Patent 817,695 - edited drawing |
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Stan Schulz
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Description: |
| "A wrench comprising a shank formed with a coaxially-stepped head and diametrically- disposed continuous furrows formed longitudinally of the stepped head."
Grooves in the sides correspond with interior lugs on various radiator fittings; a section of the shank has flat sides to facilitate turning with a wrench.
Later tools to address this type of work have similar features, without reference to this patent. |
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