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US Patent: 2,604,229
Closure Seal for Vacuum Vessels
Patentee: Ernst Schwarz (exact or similar names) - London, England USPTO Classifications: 138/104, 138/109, 138/92, 220/663, 403/270, 403/28 Tool Categories: manufacturing : manufacturing processes Assignees: Hilger & Watts, Ltd. - London, England Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 14, 1949 Granted: Jul. 22, 1952 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Hilger & Watts

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