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US Patent: 2,656,864
Straight beam clamp with adjustable self-locking jaw
Patentee: Fred P. Hopfeld (exact or similar names) - Elmwood Park, IL USPTO Classifications: 269/147, 269/167 Tool Categories: work holding : clamps : bar and pipe clamps Assignees: Grand Specialties Co. - Chicago, IL Manufacturer: Grand Specialties Co. - Chicago, IL Witnesses: Unknown	Patent Dates: Applied: Apr. 21, 1949 Granted: Oct. 27, 1953 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Carl Matthews "Vintage Machinery" entry for Grand Specialties Co.

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