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US Patent: 2,216,800
Hydraulic Control Device
Patentee: William G. Baldenhofer (exact or similar names) - Springfield, Clark County, OH USPTO Classifications: 475/339, 91/375R, 91/391R, 91/445, 91/450 Tool Categories: metalworking machines : metalworking machine mechanisms : hydraulic apparatus Assignees: Thompson Grinder Co. - Springfield, Clark County, OH Manufacturer: Thompson Grinder Co. - Springfield, Clark County, OH Witnesses: Unknown	Patent Dates: Applied: May 22, 1939 Granted: Oct. 08, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Thompson Grinder Co.
Description: This patent was listed on a Thompson Grinder Co. patent plate.

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