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US Patent: 2,924,239
Servo Valve Having Helically Arranged Metering Parts
Patentee: Stanley A. Bjorklund (exact or similar names) - Loves Park, Winnebago County, IL USPTO Classifications: 137/625.69 Tool Categories: metalworking machines : metalworking machine mechanisms Assignees: Rockford Machine Tool Co. - Rockford, Winnebago County, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 13, 1954 Granted: Feb. 09, 1960 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Rockford Machine Tool Co.

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