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US Patent: 1,621,738
Retard device
Patentees: Joseph W. Motherwell (exact or similar names) - Melrose, Middlesex County, MA Harry S. Baker (exact or similar names) - Arlington, Middlesex County, MA USPTO Classifications: 137/382, 137/385, 137/553, 137/614.17, 84/271 Tool Categories: hardware : valves Assignees: Ashton Valve Co. - Boston, Middlesex County, MA Manufacturer: Ashton Valve Co. - Boston, Middlesex County, MA Witnesses: Unknown	Patent Dates: Applied: Aug. 18, 1925 Granted: Mar. 22, 1927 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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