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US Patent: 1,480,684
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Patentee: William S. Hudson (exact or similar names) - West Medford, Middlesex County, MA USPTO Classifications: 74/594 Tool Categories: gauges : vacuum and pressure gauges Assignees: Ashton Valve Co. - Cambridge, Middlesex County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 19, 1922 Granted: Jan. 15, 1924 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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