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US Patent: 2,639,833
Vacuum Seal
Patentee: Ernst Schwarz (exact or similar names) - London, England USPTO Classifications: 220/2.3R, 220/612, 403/272 Tool Categories: manufacturing : manufacturing processes Assignees: Hilger & Watts, Ltd. - London, England Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 09, 1951 Granted: May 26, 1953 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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