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US Patent: D6,764
Design for frame of bolt-threading machines
Patentee: Salmon W. Putnam, Jr. (exact or similar names) - Fitchburg, MA USPTO Classifications: D15/141 Tool Categories: metalworking machines : metal threading machines Assignees: None Manufacturer: Not known to have been produced Witnesses: J. R. Snow R. H. Eddy S. W. Piper L. N. Miller	Patent Dates: Applied: Jan. 24, 1873 Granted: Jul. 08, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Putnam Machine Co.

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