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US Patent: 2,580,247
Cam actuated wrench
Patentees: Raymond Gaston Secondi (exact or similar names) - Paris, France Jean Vacheron (exact or similar names) - Maison-Alfort, France USPTO Classifications: 81/128, 81/53.2 Tool Categories: specialty tools : stud extractors Assignees: Raymond Gaston Secondi - Paris, France Jean Vacheron - Maison-Alfort, France Charles Henry Harrison - Paris, France Robert André Boizard - Paris, France Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 19, 1950 Granted: Dec. 25, 1951 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin
Description: This stud extractor was especially intended for removing boiler staybolts.

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