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US Patent: 140,727
Improvement in nut-tapping machines
Patentee: Salmon W. Putnam, Jr. (exact or similar names) - Fitchburg, MA USPTO Classifications: 408/124, 408/239R, 470/99 Tool Categories: specialty machines : nut or bolt making machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Henry O. Putnam Loring Sears	Patent Dates: Applied: Apr. 11, 1873 Granted: Jul. 08, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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