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US Patent: 3,083,535
Hydraulic servo system
Patentees: Walter Ernst (exact or similar names) - Dayton, OH Frederick G. Krafft (exact or similar names) - Springfield, OH USPTO Classifications: 418/31, 60/391, 60/455, 60/465, 60/476 Tool Categories: metalworking machines : metalworking machine mechanisms : hydraulic apparatus Assignees: Thompson Grinder Co. - Dayton, OH Manufacturer: Thompson Grinder Co. - Springfield, OH Witnesses: Unknown	Patent Dates: Applied: Sep. 12, 1961 Granted: Apr. 02, 1963 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Thompson Grinder Co.

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