US Patent: 1,041,978
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| Pipe Wrench
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Patentee:
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| Edward G. Diefendorf (exact or similar names) - Erie, PA |
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Patent Dates:
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| Applied: |
Dec. 04, 1911 |
| Granted: |
Oct. 22, 1912 |
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Patent Pictures:
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1 | 2
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Edward G. Diefendorf patent October 22, 1912 |
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Stan Schulz
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Description: |
| The patent is for a typical self-adjusting hook-jaw pipe wrench made of sheet metal stampings. Two alternate blanks for the handle portion are included.
Ken Cope's "American Wrench Makers 1830-1930," notes the Erie Stamping and Mfg. Co. produced this wrench. It was advertised as the ESCO pipe wrench in 1914. |
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