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US Patent: 2,606,571
Multipurpose control valve
Patentee: Walter Ernst (exact or similar names) - Dayton, OH USPTO Classifications: 137/106, 137/115.23, 137/270, 137/494, 137/505.22, 251/63 Tool Categories: metalworking machines : metalworking machine mechanisms : hydraulic apparatus Assignees: Thompson Grinder Co. - Springfield, OH Manufacturer: Thompson Grinder Co. - Springfield, OH Witnesses: Unknown	Patent Dates: Applied: Oct. 22, 1948 Granted: Aug. 12, 1952 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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