US Patent: 2,580,247
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| Cam actuated wrench
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Patentees:
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| Raymond Gaston Secondi (exact or similar names) - Paris, France |
| Jean Vacheron (exact or similar names) - Maison-Alfort, France |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 19, 1950 |
| Granted: |
Dec. 25, 1951 |
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Jeff Joslin
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Description: |
| This stud extractor was especially intended for removing boiler staybolts. |
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