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US Patent: 3,697,403
Electrochemical grinding apparatus
Patentee: Lester V. Colwell (exact or similar names) - Kalamazoo, MI USPTO Classifications: 204/218, 204/224M, 204/225, 205/641 Tool Categories: Assignees: Hammond Machinery Builders, Inc. - Kalamazoo, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Granted: Oct. 10, 1972 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hammond Machine Co.

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