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US Patent: 2,431,122
Variable Volume Hydraulic Pump of the Axially Oscillating Vane Type
Patentee: Harry S. Jakobsen (exact or similar names) - Harrison, Hudson County, NJ USPTO Classifications: 418/219, 418/28 Tool Categories: industrial machines : pumps : hydraulic pumps Assignees: J & S Tool Co. - East Orange, Essex County, NJ Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 15, 1944 Granted: Nov. 18, 1947 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for J & S Tool Co.

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