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US Patent: 664,806
Testing apparatus for pressure-gages
Patentee: Charles B. Bosworth (exact or similar names) - Everett, MA USPTO Classifications: 73/1.65 Tool Categories: Assignees: Ashton Valve Co. - Hartford, CT Manufacturer: Ashton Valve Co. - Hartford, CT Witnesses: Unknown	Patent Dates: Applied: May 28, 1900 Granted: Dec. 25, 1900 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashton Valve Co.

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