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US Patent: 2,770,821
Lead Screw Tapping Attachment Having Torque Responsive Feed Nut
Patentee: William J. Adlaf (exact or similar names) - North Riverside, Cook County, IL USPTO Classifications: 408/138, 470/176, 74/89.38 Tool Categories: metalworking machines : drilling and boring : tapping heads and chucks Assignees: Boyar-Schultz Corp. - Chicago, Cook County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 24, 1954 Granted: Nov. 20, 1956 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Boyar-Schultz Corp.

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