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US Patent: 1,407,238
Pipe Wrench
Patentee: William John Twiss (exact or similar names) - Calgary, AB Canada USPTO Classifications: 81/111, 81/118, 81/DIG.9 Tool Categories: wrenches : pipe wrenches Assignees: William John Twiss - Calgary, AB Canada John I. McFarland - Calgary, AB Canada Manufacturer: Not known to have been produced Witnesses: Eric L. Harvie Mae Acton	Patent Dates: Applied: Jun. 22, 1921 Granted: Feb. 21, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Stan Schulz

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