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US Patent: 1,938,758
Spindle Oscillator
Patentee: Hans Ernst (exact or similar names) - Cincinnati, OH USPTO Classifications: 137/886, 184/7.4, 451/156, 60/369, 91/305, 91/434 Tool Categories: metalworking machines : grinding machines Assignees: Cincinnati Grinders, Inc. - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 13, 1929 Granted: Dec. 12, 1933 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Grinders, Inc.

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