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US Patent: 1,971,290
Ratchet mechanism
Patentees: John Herbert Abramson (exact or similar names) - Rockford, IL Edwin C. Swanson (exact or similar names) - Rockford, IL USPTO Classifications: 74/127 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: Greenlee Brothers & Co. - Rockford, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 10, 1933 Granted: Aug. 21, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward George Langford

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