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US Patent: 871,451
Screw-cutting die and holder therefor
Patentee: Albert J. Smart (exact or similar names) - Greenfield, MA USPTO Classifications: 408/156, 408/163, 408/200, 470/185 Tool Categories: wrenches : tap wrenches and die stocks metalworking tools : taps and dies industrial tools : taps and dies Assignees: None Manufacturer: Greenfield Tap & Die Corp. - Greenfield, MA Witnesses: John D. Bouker Francis N. Thompson	Patent Dates: Applied: Oct. 30, 1906 Granted: Nov. 19, 1907 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Stan Schulz "Vintage Machinery" entry for Greenfield Tap & Die Corp.
Description: This die and holder was sold by Greenfield Tap & Die as the "Acorn Die and Holder", and appeared in the Catalog 39, which was published about 1918.

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