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US Patent: 1,820,653
Hydraulic Valve
Patentee: Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 137/625.48 Tool Categories: metalworking machines : metalworking presses : hydraulic metalworking presses Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Witnesses: Unknown	Patent Dates: Applied: Mar. 08, 1930 Granted: Aug. 25, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.
Description: This patent number was seen on a Cincinnati Milling Machine Co. patent plate 4FV-101.

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