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US Patent: 2,518,835
Filter system
Patentee: Otto Murray Summers (exact or similar names) - Glasgow, KY USPTO Classifications: 210/254, 210/258, 210/315, 210/433.1, 210/499, 210/93, 222/377 Tool Categories: metalworking machines : metalworking machine mechanisms : coolant apparatus Assignees: Thompson Grinder Co. - Springfield, OH Manufacturer: Thompson Grinder Co. - Springfield, OH Witnesses: Unknown	Patent Dates: Applied: Feb. 13, 1946 Granted: Aug. 15, 1950 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Thompson Grinder Co.
Description: This coolant/lubricant filtration system is intended for grinders, which produce lots of very small particles.

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