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US Patent: 2,287,456
Sealing Means
Patentee: Roscoe C. Springston (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 277/515, 92/135, 92/194, 92/249 Tool Categories: industrial machines : industrial machine mechanisms : shaft seals industrial tools : pressure regulators Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 28, 1940 Granted: Jun. 23, 1942 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Detroit Lubricator Co.

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