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US Patent: 2,040,990
Hydraulic Control Mechanism
Patentees: Frederick S. Haas (exact or similar names) - Cincinnati, OH Ralph L. Goetzel (exact or similar names) - Cincinnati, OH USPTO Classifications: 137/637.2, 91/279 Tool Categories: metalworking machines : grinding machines Assignees: Cincinnati Grinders, Inc. - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 29, 1932 Granted: May 19, 1936 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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